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{{UMoS guideline}} | {{UMoS guideline}} | ||
This page guides the presentation of numbers, dates, times, measurements, currencies and similar material in articles. Its aim is to promote clarity and cohesion; this is especially important | This page guides the presentation of numbers, dates, times, measurements, currencies and similar material in articles. Its aim is to promote clarity and cohesion; this is especially important ''within'' an article. The goal is to make the whole UniWiki easier and more intuitive to use. | ||
Where this manual provides options, consistency should be maintained within an article unless there is a good reason to do otherwise. If discussion cannot determine which style to use in an article, defer to the style used by the first major contributor. | Where this manual provides options, consistency should be maintained within an article unless there is a good reason to do otherwise. If discussion cannot determine which style to use in an article, defer to the style used by the first major contributor. | ||
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Except on pages updated regularly, terms such as {{!xt|now}}, {{!xt|currently}}, {{!xt|to date}}, {{!xt|so far}}, {{!xt|soon}}, and {{!xt|recently}} should usually be avoided in favor of phrases such as {{xt|during the 1990s}}, {{xt|since 2010}}, and {{xt|in August 1969}}. For current and future events, use phrases like {{xt|as of {{CURRENTMONTHNAME}} {{CURRENTYEAR}} }} or {{xt|since the beginning of {{CURRENTYEAR}} }} to signal the time-dependence of the information. | Except on pages updated regularly, terms such as {{!xt|now}}, {{!xt|currently}}, {{!xt|to date}}, {{!xt|so far}}, {{!xt|soon}}, and {{!xt|recently}} should usually be avoided in favor of phrases such as {{xt|during the 1990s}}, {{xt|since 2010}}, and {{xt|in August 1969}}. For current and future events, use phrases like {{xt|as of {{CURRENTMONTHNAME}} {{CURRENTYEAR}} }} or {{xt|since the beginning of {{CURRENTYEAR}} }} to signal the time-dependence of the information. | ||
However, do not replace {{xt|since the beginning of 2005}} with {{xt|as of 2005}} because some information (the | However, do not replace {{xt|since the beginning of 2005}} with {{xt|as of 2005}} because some information (the ''beginning'' of 2005) would be lost. | ||
Relative-time expressions are acceptable for very long periods, such as geological epochs: {{xt|Humans diverged from other primates long ago, but [[wikiquote:Samuel Butler (novelist)#legislature|only recently developed state legislatures]]. }} | Relative-time expressions are acceptable for very long periods, such as geological epochs: {{xt|Humans diverged from other primates long ago, but [[wikiquote:Samuel Butler (novelist)#legislature|only recently developed state legislatures]]. }} | ||
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| {{xt|August{{nbsp}}2, 2001}} | | {{xt|August{{nbsp}}2, 2001}} | ||
| {{xt|Aug{{nbsp}}2, 2001}} | | {{xt|Aug{{nbsp}}2, 2001}} | ||
| A comma follows the year unless followed by other punctuation:<ref>See {{Section link|UniWiki:Manual of Style|Commas}}</ref><br />* {{xt|The weather on March 12, 2005, was clear and warm}}<br /> * {{xt|Everyone remembers July{{nbsp}}21, 1969 | | A comma follows the year unless followed by other punctuation:<ref>See {{Section link|UniWiki:Manual of Style|Commas}}</ref><br />* {{xt|The weather on March 12, 2005, was clear and warm}}<br /> * {{xt|Everyone remembers July{{nbsp}}21, 1969 - when man first landed on the Moon}} | ||
|- | |- | ||
| {{xt|2{{nbsp}}August}} | | {{xt|2{{nbsp}}August}} | ||
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|- | |- | ||
| {{!xt|15-04-2007}}<br />{{!xt|04-15-2007}} | | {{!xt|15-04-2007}}<br />{{!xt|04-15-2007}} | ||
| Do not use <var>dd</var>-<var>mm</var>-<var>yyyy</var>, <var>mm</var>-<var>dd</var>-<var>yyyy</var> or <var>yyyy</var>-<var>dd</var>-<var>mm</var> formats, as they are ambiguous for some dates<ref>These formats cannot, in general, be distinguished on sight, because there are usages in which 03-04-2007 represents March{{nbsp}}4, and other usages in which it represents April{{nbsp}}3. In contrast there is no common usage in which | | Do not use <var>dd</var>-<var>mm</var>-<var>yyyy</var>, <var>mm</var>-<var>dd</var>-<var>yyyy</var> or <var>yyyy</var>-<var>dd</var>-<var>mm</var> formats, as they are ambiguous for some dates<ref>These formats cannot, in general, be distinguished on sight, because there are usages in which 03-04-2007 represents March{{nbsp}}4, and other usages in which it represents April{{nbsp}}3. In contrast there is no common usage in which 2007-04-03 represents anything other than April{{nbsp}}3.</ref> | ||
|- | |- | ||
| {{!xt|7/2001}}<br />{{!xt|7-2001}}<br />{{!xt|07-2001}}<br />{{!xt|2001-07}}<br />{{!xt|2001 July}}<br />{{!xt|July of 2001}} | | {{!xt|7/2001}}<br />{{!xt|7-2001}}<br />{{!xt|07-2001}}<br />{{!xt|2001-07}}<br />{{!xt|2001 July}}<br />{{!xt|July of 2001}} | ||
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| Do not use these{{nbsp}}formats. | | Do not use these{{nbsp}}formats. | ||
|- | |- | ||
| {{!xt|July''',''' 2001}} | | | ||
{{!xt|July''',''' 2001}} | |||
| rowspan=2| No comma between month and{{nbsp}}year | | rowspan=2| No comma between month and{{nbsp}}year | ||
|- | |- | ||
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====Ranges==== | ====Ranges==== | ||
* Use a dash, or a word such as ''from'' or ''between'', but not both: {{xt|from 1881 to 1886}} (not {{!xt|from 1881{{ndash}}1886}});{{nbsp}} {{xt|between June{{nbsp}}1 and July{{nbsp}}3}} (not {{!xt|between June{{nbsp}}1 | * Use a dash, or a word such as ''from'' or ''between'', but not both: {{xt|from 1881 to 1886}} (not {{!xt|from 1881{{ndash}}1886}});{{nbsp}} {{xt|between June{{nbsp}}1 and July{{nbsp}}3}} (not {{!xt|between June{{nbsp}}1 - July{{nbsp}}3}}) | ||
* A simple '''year{{ndash}}year''' range is written using an en dash (<code>&ndash;</code>) not a hyphen or slash; this dash is usually | * A simple '''year{{ndash}}year''' range is written using an en dash (<code>&ndash;</code>) not a hyphen or slash; this dash is usually ''unspaced'' (that is, with no space on either side); and the range's end year is usually given in full: | ||
: • {{xt|1881{{ndash}}1886}};{{nbsp}} {{xt|1881{{ndash}}1992}} (not {{!xt|1881{{ndash}}86}};{{nbsp}} {{!xt|1881 | : • {{xt|1881{{ndash}}1886}};{{nbsp}} {{xt|1881{{ndash}}1992}} (not {{!xt|1881{{ndash}}86}};{{nbsp}} {{!xt|1881 - 1992}}) | ||
:: Markup: <code>1881{{t|ndash}}1886</code> or <code>1881&ndash;1886</code> | :: Markup: <code>1881{{t|ndash}}1886</code> or <code>1881&ndash;1886</code> | ||
:* '''Two-digit ending years''' ({{xt|1881{{ndash}}82}}, but never {{!xt|1881{{ndash}}882}} or {{!xt|1881{{ndash}}2}}) ''may'' be used in the case of ''two consecutive years;'' in infoboxes and tables where space is limited (using a single format consistently in any given table column); or in certain topic areas if there is a very good reason, such as matching the established convention of reliable sources. | :* '''Two-digit ending years''' ({{xt|1881{{ndash}}82}}, but never {{!xt|1881{{ndash}}882}} or {{!xt|1881{{ndash}}2}}) ''may'' be used in the case of ''two consecutive years;'' in infoboxes and tables where space is limited (using a single format consistently in any given table column); or in certain topic areas if there is a very good reason, such as matching the established convention of reliable sources. | ||
:*The '''slash notation''' ({{xt|2005/2006}}) may be used to signify a fiscal year or other special period, if that convention is used in reliable sources. | :*The '''slash notation''' ({{xt|2005/2006}}) may be used to signify a fiscal year or other special period, if that convention is used in reliable sources. | ||
* Other "simple" ranges use an | * Other "simple" ranges use an ''unspaced'' en dash as well: | ||
:* '''day{{ndash}}day''': {{xt|5{{ndash}}7{{nbsp}}January 1979}};{{nbsp}} {{xt|January{{nbsp}}5{{ndash}}7, 1979}};{{nbsp}} {{xt|elections were held March 5{{ndash}}8}} | :* '''day{{ndash}}day''': {{xt|5{{ndash}}7{{nbsp}}January 1979}};{{nbsp}} {{xt|January{{nbsp}}5{{ndash}}7, 1979}};{{nbsp}} {{xt|elections were held March 5{{ndash}}8}} | ||
:* '''month{{ndash}}month''': {{xt|the 1940 peak period was May{{ndash}}July}};{{nbsp}} {{xt|the peak period was May{{ndash}}July{{nbsp}}1940}};{{nbsp}} (but {{xt|the peak period was May 1940 | :* '''month{{ndash}}month''': {{xt|the 1940 peak period was May{{ndash}}July}};{{nbsp}} {{xt|the peak period was May{{ndash}}July{{nbsp}}1940}};{{nbsp}} (but {{xt|the peak period was May 1940 - July 1940}} uses a ''spaced'' en dash; ''see below''. | ||
* If at least one of the items on either side of the en dash contains a space, then a | * If at least one of the items on either side of the en dash contains a space, then a ''spaced'' en dash ({{tl|snd}}) is used: | ||
:* '''between specific dates in different months''': {{xt|They travelled June{{nbsp}}3 | :* '''between specific dates in different months''': {{xt|They travelled June{{nbsp}}3 - August{{nbsp}}18, 1952}};{{nbsp}} {{xt|They travelled 3{{nbsp}}June - 18{{nbsp}}August 1952}} | ||
:* '''between dates in different years''': | :* '''between dates in different years''': | ||
:: {{xt|'''Charles Robert Darwin''' (12{{nbsp}}February 1809 | :: {{xt|'''Charles Robert Darwin''' (12{{nbsp}}February 1809 - 19{{nbsp}}April}} 1882) was an English naturalist{{nbsp}}... | ||
:: Markup: <code>12{{t|nbsp}}February 1809{{t|snd}}19{{t|nbsp}}April 1882</code> or <code>12&nbsp;February 1809&nbsp;&ndash; 19&nbsp;April 1882</code> | :: Markup: <code>12{{t|nbsp}}February 1809{{t|snd}}19{{t|nbsp}}April 1882</code> or <code>12&nbsp;February 1809&nbsp;&ndash; 19&nbsp;April 1882</code> | ||
:: {{xt|'''Abraham Lincoln''' (February{{nbsp}}12, 1809 | :: {{xt|'''Abraham Lincoln''' (February{{nbsp}}12, 1809 - April{{nbsp}}15, 1865) was the 16th President of{{nbsp}}...}} | ||
:* '''between months in different years''': {{xt|The exception was in force August 1892 | :* '''between months in different years''': {{xt|The exception was in force August 1892 - January 1903}};{{nbsp}} {{xt|The Ghent Incursion (March 1822 - January{{nbsp}}1, 1823) was ended by the New Year's Treaty}} | ||
:: Markup: <code>March 1822{{t|snd}}January{{t|nbsp}}1, 1823</code> or | :: Markup: <code>March 1822{{t|snd}}January{{t|nbsp}}1, 1823</code> or <code>March 1822&nbsp;&ndash; January&nbsp;1, 1823</code> | ||
:* '''Where ''circa'' or other modifiers are used''': {{xt|reigned c. 1393 | :* '''Where ''circa'' or other modifiers are used''': {{xt|reigned c. 1393 - 1414}} ''See {{section link||Uncertain, incomplete, or approximate dates}}, below.'' | ||
* Constructions such as {{xt|1982{{ndash}}present}} (with unspaced ndash), {{xt|January 1, 2011 | * Constructions such as {{xt|1982{{ndash}}present}} (with unspaced ndash), {{xt|January 1, 2011 - present}} (spaced ndash), or {{xt|January 2011 - present}} (spaced ndash) may be used where appropriate, but other constructions may be more appropriate in prose ''(see {{section link||Statements likely to become outdated}}). In tables and infoboxes where space is limited, ''pres.'' may be used ({{xt|1982{{ndash}}pres.}}). Do not use incomplete-looking constructions such as {{!xt|1982{{ndash}}}} and {{!xt|1982{{ndash}}... .}} | ||
* For a '''person still living''': {{xt|'''Serena Williams''' (born September{{nbsp}}26, 1981) is a{{nbsp}}...}}, not {{!xt|(September{{nbsp}}26, 1981 | * For a '''person still living''': {{xt|'''Serena Williams''' (born September{{nbsp}}26, 1981) is a{{nbsp}}...}}, not {{!xt|(September{{nbsp}}26, 1981 - )}} or {{!xt|(born on September{{nbsp}}26, 1981)}}. | ||
:Do not use <code>*</code> to indicate ''born''; use <code>b.</code> only where space is limited e.g. tables and infoboxes; use either <code>born</code> or <code>b.</code> consistently in any given table column. | :Do not use <code>*</code> to indicate ''born''; use <code>b.</code> only where space is limited e.g. tables and infoboxes; use either <code>born</code> or <code>b.</code> consistently in any given table column. | ||
* Where '''birthdate is unknown''': {{xt|'''John Smith''' (died May{{nbsp}}1, 1622){{nbsp}}...}} or {{xt|'''John Smith''' (died 1622){{nbsp}}...}} | * Where '''birthdate is unknown''': {{xt|'''John Smith''' (died May{{nbsp}}1, 1622){{nbsp}}...}} or {{xt|'''John Smith''' (died 1622){{nbsp}}...}} | ||
:Do not use <code>†</code> to indicate ''died''; use <code>d.</code> only where space is limited, with consistency within any given table column. | :Do not use <code>†</code> to indicate ''died''; use <code>d.</code> only where space is limited, with consistency within any given table column. | ||
* An '''overnight period''' may be expressed using a slash between two contiguous dates: {{xt|the night raids of 30/31{{nbsp}}May 1942}} or {{xt|raids of 31{{nbsp}}May{{nbsp}}/ 1{{nbsp}}June 1942}}. | * An '''overnight period''' may be expressed using a slash between two contiguous dates: {{xt|the night raids of 30/31{{nbsp}}May 1942}} or {{xt|raids of 31{{nbsp}}May{{nbsp}}/ 1{{nbsp}}June 1942}}. | ||
: Or use an en dash: (unspaced) {{xt|raids of 30{{ndash}}31{{nbsp}}May 1942}};{{nbsp}} (spaced) {{xt|raids of 31{{nbsp}}May | : Or use an en dash: (unspaced) {{xt|raids of 30{{ndash}}31{{nbsp}}May 1942}};{{nbsp}} (spaced) {{xt|raids of 31{{nbsp}}May - 1{{nbsp}}June 1942}}. | ||
====Uncertain, incomplete, or approximate dates==== | ====Uncertain, incomplete, or approximate dates==== | ||
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: • {{xt|At the birth of Roger Bacon (c. 1214){{nbsp}}...}} | : • {{xt|At the birth of Roger Bacon (c. 1214){{nbsp}}...}} | ||
* Where both endpoints of a range are approximate, c. should appear before each date: | * Where both endpoints of a range are approximate, c. should appear before each date: | ||
: • {{xt|'''Dionysius Exiguus''' (c. 470 | : • {{xt|'''Dionysius Exiguus''' (c. 470 - c. 540){{nbsp}}...}} (not {{!xt|'''Dionysius Exiguus''' (c. 470 - 540){{nbsp}}...}}) | ||
: • {{xt|'''Rameses III''' (reigned c. 1180 – c. 1150{{nbsp}}BCE){{nbsp}}...}} (not {{!xt|'''Rameses III''' (reigned c. 1180 | : • {{xt|'''Rameses III''' (reigned c. 1180 – c. 1150{{nbsp}}BCE){{nbsp}}...}} (not {{!xt|'''Rameses III''' (reigned c. 1180 - 1150{{nbsp}}BCE){{nbsp}}...}}) | ||
* When a date is known to be either of two years (e.g. from a [[Wikipedia:Regnal years of English monarchs|regnal]] or [[Wikipedia:Hijri year|AH]] year conversion, or a known age at death): | * When a date is known to be either of two years (e.g. from a [[Wikipedia:Regnal years of English monarchs|regnal]] or [[Wikipedia:Hijri year|AH]] year conversion, or a known age at death): | ||
: • {{xt|'''Anne Smith''' (born 1912 or 1913; died 2013){{nbsp}}...}} | : • {{xt|'''Anne Smith''' (born 1912 or 1913; died 2013){{nbsp}}...}} | ||
* Other forms of uncertainty should be expressed in words, either in article text or in a footnote: {{xt|April{{nbsp}}14, 1224 (unattested date)}}. Do not use a question mark ({{!xt|1291?}}), because it fails to communicate the nature of the uncertainty. | * Other forms of uncertainty should be expressed in words, either in article text or in a footnote: {{xt|April{{nbsp}}14, 1224 (unattested date)}}. Do not use a question mark ({{!xt|1291?}}), because it fails to communicate the nature of the uncertainty. | ||
* Ranges in which {{xt|c.}}, {{xt|after}}, {{xt|fl.}} or similar forms appear—whether on one or both sides—employ a ''spaced'' endash (<code><nowiki> | * Ranges in which {{xt|c.}}, {{xt|after}}, {{xt|fl.}} or similar forms appear—whether on one or both sides—employ a ''spaced'' endash (<code><nowiki> - </nowiki></code>) and ideally a nonbreaking space should follow very short modifiers such as {{xt|c.}} and {{xt|fl.}}. ''Markup:'' <code><nowiki>1896 - after 1954</nowiki></code> | ||
===<span id="Day, month and season names"></span><span id="Longer periods"></span><span id="Other periods"></span>Other=== | ===<span id="Day, month and season names"></span><span id="Longer periods"></span><span id="Other periods"></span>Other=== | ||
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==Numbers== | ==Numbers== | ||
===Numbers as figures or words=== | ===Numbers as figures or words=== | ||
''See also information on specific situations, elsewhere in this guideline.'' | ''See | ||
also information on specific situations, elsewhere in this guideline.'' | |||
Generally, in article text: | Generally, in article text: | ||
* Integers from zero to nine are spelled out in words. | * Integers from zero to nine are spelled out in words. | ||
* Integers greater than nine | * Integers greater than nine ''expressible in one or two words'' may be expressed either in numerals or in words ({{xt|16}} or {{xt|sixteen}}, {{xt|84}} or {{xt|eighty-four}}, {{xt|200}} or {{xt|two hundred}}). Numbers between 21 and 99 are hyphenated (including when part of a larger number): {{xt|fifty-six}} or {{xt|fifty-six thousand}} but {{xt|five{{nbsp}}hundred}} or {{xt|five{{nbsp}}thousand}}. | ||
* Other numbers are given in numerals ({{xt|3.75}}, {{xt|544}}) or in forms such as {{xt|21{{nbsp}}million}}. Markup: <code><nowiki>21{{nbsp}}million</nowiki></code> | * Other numbers are given in numerals ({{xt|3.75}}, {{xt|544}}) or in forms such as {{xt|21{{nbsp}}million}}. Markup: <code><nowiki>21{{nbsp}}million</nowiki></code> | ||
:* "billion" and "trillion" are understood to represent their [[Wikipedia:Long and short scales|short-scale]] values of 10<sup>9</sup>{{nbsp}}(1,000,000,000) and 10<sup>12</sup>{{nbsp}}(1,000,000,000,000), respectively. Keep this in mind when using material from non-English sources. | :* "billion" and "trillion" are understood to represent their [[Wikipedia:Long and short scales|short-scale]] values of 10<sup>9</sup>{{nbsp}}(1,000,000,000) and 10<sup>12</sup>{{nbsp}}(1,000,000,000,000), respectively. Keep this in mind when using material from non-English sources. | ||
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: • {{xt|86{{nbsp}}men and 103{{nbsp}}women}}, not {{!xt|eighty-six men and 103 women}} | : • {{xt|86{{nbsp}}men and 103{{nbsp}}women}}, not {{!xt|eighty-six men and 103 women}} | ||
: • {{xt|There were 3 winners and 206 losers}}, even though ''3'' would normally be given as ''three''; or {{xt|Three won and two hundred six lost}} (or ''two hundred '''and''' six'' in British English), even though ''two hundred six'' would normally be given as ''206''); but not {{!xt|There were three winners and 206 losers}}. | : • {{xt|There were 3 winners and 206 losers}}, even though ''3'' would normally be given as ''three''; or {{xt|Three won and two hundred six lost}} (or ''two hundred '''and''' six'' in British English), even though ''two hundred six'' would normally be given as ''206''); but not {{!xt|There were three winners and 206 losers}}. | ||
* But adjacent quantities not comparable should usually be in | * But adjacent quantities not comparable should usually be in ''different formats:'' {{xt|twelve 90-minute volumes}} or {{xt|12 ninety-minute volumes}}, not {{!xt|12 90-minute volumes}} or {{!xt|twelve ninety-minute volumes}}. | ||
:* Avoid awkward juxtapositions: {{xt|On February 25, 2011, twenty-one more were chosen}}, not {{!xt|On February 25, 2011, 21 more were chosen}}. | :* Avoid awkward juxtapositions: {{xt|On February 25, 2011, twenty-one more were chosen}}, not {{!xt|On February 25, 2011, 21 more were chosen}}. | ||
* Personal ages are typically stated in figures ({{xt|8-year-old child}}) except for large, approximate values ({{xt|69-million-year-old fossil}}). | * Personal ages are typically stated in figures ({{xt|8-year-old child}}) except for large, approximate values ({{xt|69-million-year-old fossil}}). | ||
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: • Not {{!xt|There were many matches'''.''' 23 ended in a draw}}, | : • Not {{!xt|There were many matches'''.''' 23 ended in a draw}}, | ||
: but {{xt|There were many matches''';''' 23{{nbsp}}ended in a draw}} or {{xt|There were many matches'''.''' Twenty-three ended in a draw}}. | : but {{xt|There were many matches''';''' 23{{nbsp}}ended in a draw}} or {{xt|There were many matches'''.''' Twenty-three ended in a draw}}. | ||
: • Not {{!xt|1945 and 1950 saw crucial elections}} (nor {{!xt|Nineteen forty-five and 1950 saw crucial elections}} | : • Not {{!xt|1945 and 1950 saw crucial elections}} (nor {{!xt|Nineteen forty-five and 1950 saw crucial elections}} - because comparable numbers should be both written in words or both in figures) but {{xt|The elections of 1945 and 1950 were crucial.}} | ||
:* Exception: Where a proper name, technical term, etc., itself beginning with a numeral, opens the sentence ({{xt|1-Naphthylamine is typically synthesized via the Feldenshlager{{ndash}}Glockenspiel process}}) although this can usually be avoided by rewording ({{xt|Feldenshlager{{ndash}}Glockenspiel is the process typically used in the synthesis of 1-naphthylamine}}). | :* Exception: Where a proper name, technical term, etc., itself beginning with a numeral, opens the sentence ({{xt|1-Naphthylamine is typically synthesized via the Feldenshlager{{ndash}}Glockenspiel process}}) although this can usually be avoided by rewording ({{xt|Feldenshlager{{ndash}}Glockenspiel is the process typically used in the synthesis of 1-naphthylamine}}). | ||
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===Singular versus plural=== | ===Singular versus plural=== | ||
* Nouns following [[Simple fractions|simple fractions]] are singular ({{xt|He took | * Nouns following [[Wikipedia:Simple fractions|simple fractions]] are singular ({{xt|He took <sup>1</sup>⁄<sub>4</sub> dose}};{{nbsp}} {{xt|net change in score was −<sup>1</sup>⁄<sub>2</sub> point}};{{nbsp}} {{xt|<sup>3</sup>⁄<sub>2</sub> dose}}). | ||
* Nouns following mixed numbers are plural ({{xt|suicide victim knew even 1 | * Nouns following mixed numbers are plural ({{xt|suicide victim knew even 1<sup>1</sup>⁄<sub>2</sub> doses could be fatal}};{{nbsp}} {{xt|continued another 4<sup>3</sup>⁄<sub>4</sub> miles}}). | ||
* Nouns following the lone, unsigned digit 1 are singular, but those following other decimal numbers (i.e. base-10 numbers not involving fractions) are plural ({{xt|increased 0.7 percentage points}};{{nbsp}} {{xt|365.25 days}};{{nbsp}} {{xt|paid 5 dollars per work hour, 1 dollar per travel hour, 0 dollars per standby hour}};{{nbsp}} {{xt|increased by 1 point}} but {{xt|net change +1 points}};{{nbsp}} {{xt|net change −1 points}};{{nbsp}} {{xt|net change 1.0 points}}). | * Nouns following the lone, unsigned digit 1 are singular, but those following other decimal numbers (i.e. base-10 numbers not involving fractions) are plural ({{xt|increased 0.7 percentage points}};{{nbsp}} {{xt|365.25 days}};{{nbsp}} {{xt|paid 5 dollars per work hour, 1 dollar per travel hour, 0 dollars per standby hour}};{{nbsp}} {{xt|increased by 1 point}} but {{xt|net change +1 points}};{{nbsp}} {{xt|net change −1 points}};{{nbsp}} {{xt|net change 1.0 points}}). | ||
* The same rules apply to numbers given in words ({{xt|one dose}};{{nbsp}} {{xt|one and one-half doses}};{{nbsp}} {{xt|zero dollars}};{{nbsp}} {{xt|net change negative one points}}). | * The same rules apply to numbers given in words ({{xt|one dose}};{{nbsp}} {{xt|one and one-half doses}};{{nbsp}} {{xt|zero dollars}};{{nbsp}} {{xt|net change negative one points}}). | ||
=== | ===Fractions and ratios=== | ||
* Spelled-out fractions are hyphenated: {{xt|seven-eighths}}. | * Spelled-out fractions are hyphenated: {{xt|seven-eighths}}. | ||
* Where numerator and denominator can each be expressed in one word, a fraction is usually [[Fractions#Pronunciation and spelling|spelled out]] (e.g. {{xt|a two-thirds majority}}; {{nbsp}}{{xt|moved one-quarter mile}}); use figures if a fraction appears with a symbol (e.g. {{xt| | * Where numerator and denominator can each be expressed in one word, a fraction is usually [[Wikipedia:Fractions#Pronunciation and spelling|spelled out]] (e.g. {{xt|a two-thirds majority}}; {{nbsp}}{{xt|moved one-quarter mile}}); use figures if a fraction appears with a symbol (e.g. {{xt|<sup>1</sup>⁄<sub>4</sub>{{nbsp}}mi}} - markup: <code><nowiki><sup>1</sup>&frasl;<sub>4</sub>&nbsp;mi</nowiki></code>, not {{!xt|a quarter of a mi}} or {{!xt|one-quarter mi}}). | ||
* [[Mixed numbers]] are usually given in figures, unspaced (not {{!xt|Fellini's film ''8{{nbsp}} | * [[Wikipedia:Mixed numbers|Mixed numbers]] are usually given in figures, unspaced (not {{!xt|Fellini's film ''8{{nbsp}}<sup>1</sup>⁄<sub>2</sub>''}} or {{!xt|''8-<sup>1</sup>⁄<sub>2</sub>''}} but {{xt|Fellini's film ''8<sup>1</sup>⁄<sub>2</sub>''}} - markup: <code><nowiki>8<sup>1</sup>&frasl;<sub>2</sub></nowiki></code>). In any case the integer and fractional parts should be consistent (not {{!xt|nine and{{nbsp}}<sup>1</sup>⁄<sub>2</sub>}}). | ||
* Metric (SI) measurements generally use decimals, not fractions ({{xt|5.25{{nbsp}}mm}}, not {{!xt|5 | * Metric (SI) measurements generally use decimals, not fractions ({{xt|5.25{{nbsp}}mm}}, not {{!xt|5<sup>1</sup>⁄<sub>4</sub>{{nbsp}}mm}}). | ||
* Do not use special characters such as "½" (deprecated markup: <s><code>&frac12;</code></s> or <s><code>&#189;</code></s>). | * Do not use special characters such as "½" (deprecated markup: <s><code>&frac12;</code></s> or <s><code>&#189;</code></s>). | ||
* Ordinal suffixes such as | * Ordinal suffixes such as '''-th''' should not be used with fractions expressed in figures (not {{!xt|each US state has 1/50th of the [[Wikipedia:United States Senate|Senate's]] votes}}; {{!xt|1/8th mile}}, but {{xt|one-fiftieth of the [[Wikipedia:United States Senate|Senate's]] votes}}; {{xt|1/8 mile}}; {{xt|one-eighth mile}}). | ||
*Dimensionless ratios (i.e. those not incorporating units) are given using numerals and a colon, or numbers-as-words and ''to'': {{ xt|favored by a 3:1 ratio}} or | * Dimensionless ratios (i.e. those not incorporating units) are given using numerals and a colon, or numbers-as-words and ''to'': {{xt|favored by a 3:1 ratio}} or {{xt|a three-to-one ratio}}, but not {{!xt|a 3/1 ratio}} or {{!xt|a 3–1 ratio}}. Use a "spaced" colon when a decimal point is present ({{xt|a 3.5 : 1 ratio}} - markup: <code>a 3.5&nbsp;:&nbsp;1 ratio</code>). Do not use the colon form where units are involved ({{!xt|dissolve using a 3 ml:1 g ratio}})—instead see ''ratios'' section of table at [[#Unit names and symbols|§ Unit names and symbols]], below.'' | ||
===Decimals=== | |||
* A period/full point (<code>.</code>), ''never'' a comma, is used as the decimal point ({{xt|6.57}}, not {{!xt|6,57}}). | |||
* Numbers between −1 and +1 require a leading zero ({{xt|0.02}}, not {{!xt|.02}}); exceptions are sporting performance averages ({{xt|.430 [[Wikipedia:Batting average|batting average]]}}) and commonly used terms such as {{xt|.22{{nbsp}}caliber}}. | |||
* Indicate repeating digits with an [[Wikipedia:Vinculum (symbol)|overbar]] e.g. <code><nowiki>14.31<span style="text-decoration:overline">28</span></nowiki></code> gives <span style="color:green">14.31<span style="text-decoration:overline">28</span></span>. (Consider explaining this notation on first use.) Do not write e.g. {{!xt|14.31(28)}} because it resembles notations for {{section link||Uncertainty and rounding}}. | |||
=== | ====Grouping | ||
of digits==== | |||
* Digits should be grouped and separated by commas, (''never'' a period/full point). | |||
* Digits should be grouped and separated | |||
:; Grouping with commas | :; Grouping with commas | ||
:* Left of the decimal point, five or more digits are grouped into threes separated by commas (e.g. {{xt|12,200}}, {{xt|255,200 km}}, {{xt|8,274,527th}}, {{xt| | :* Left of the decimal point, five or more digits are grouped into threes separated by commas (e.g. {{xt|12,200}}, {{xt|255,200 km}}, {{xt|8,274,527th}}, {{xt|<sup>1</sup>⁄<sub>86,400</sub>}}). | ||
:* Numbers with exactly four digits left of the decimal point may optionally be grouped (either {{xt|1,250}} or {{xt|1250}}), provided that this is consistent within each article. | :* Numbers with exactly four digits left of the decimal point may optionally be grouped (either {{xt|1,250}} or {{xt|1250}}), provided that this is consistent within each article. | ||
:* When commas are used left of the decimal point, digits right of the decimal point are not grouped (i.e. should be given as an unbroken string). | :* When commas are used left of the decimal point, digits right of the decimal point are not grouped (i.e. should be given as an unbroken string). | ||
* Delimiting style should be consistent throughout a given article. | * Delimiting style should be consistent throughout a given article. | ||
:* Either group the thousands in a four-digit number or do not, but not mixed use in the same article. | :* Either group the thousands in a four-digit number or do not, but not mixed use in the same article. | ||
:* However, grouping by threes and fives may coexist. | :* However, grouping by threes and fives may coexist. | ||
* An exception is made for four-digit page numbers or four-digit calendar years. These should never be grouped (not {{!xt|sailed in 1,492}}, though {{xt|dynasty collapsed around 10,400 BC | * An exception is made for four-digit page numbers or four-digit calendar years. These should never be grouped (not {{!xt|sailed in 1,492}}, though {{xt|dynasty collapsed around 10,400 BC}}). | ||
===Percentages=== | ===Percentages=== | ||
* In the body of non-scientific/non-technical articles, '''percent''' (American English) or '''per cent''' (British English) are commonly used: {{xt|10 percent}}; {{xt|ten percent}}; {{xt|4.5 per cent}}. Ranges are written {{xt|ten to twelve per cent}} or {{xt|ten to twelve percent}}, not {{!xt|ten{{ndash}}twelve per cent}} or {{!xt|ten to twelve{{nbsp}}%}}. | |||
* | * In the body of scientific/{{zwsp}}technical articles, and in ''tables and infoboxes'' of any article, the symbol <code>%</code> (unspaced) is more common: {{xt|71%}}, not {{!xt|71 %}} or {{!xt|three %}}. Ranges: {{xt|10{{ndash}}12%}}, not {{!xt|10%{{ndash}}12%}} or {{!xt|10 to 12%}}. | ||
* When expressing the difference between two percentages, do not confuse a percentage change with a change in [[Wikipedia:Percentage point|percentage points]]. | |||
* In | |||
Markup: {{ | ===Scientific notation=== | ||
* [[Wikipedia:Scientific notation|Scientific notation]] always has a single nonzero digit to the left of the point: not {{!xt|60.22 × 10<sup>22</sup>}}, but {{xt|6.022 × 10<sup>23</sup>}}. | |||
* In a table column (or other presentation) in which all values can be expressed with a single power of 10, consider giving e.g. {{xt| × 10<sup>7</sup>}} once in the column header, and omitting it in the individual entries. (Markup: <code><nowiki>&nbsp;&times;&nbsp;10<sup>7</sup></nowiki></code>) | |||
* The number of digits indicates the precision. For example, {{xt|5 × 10<sup>3</sup>}} means rounded to the nearest thousand; {{xt|5.0 × 10<sup>3</sup>}} to the nearest hundred; {{xt|5.00 × 10<sup>3</sup>}} to the nearest ten; and {{xt|5.000 × 10<sup>3</sup>}} to the nearest unit. | |||
===Uncertainty and rounding | ===Uncertainty and rounding=== | ||
* Where explicit uncertainty information (such as a [[margin of error]]) is available and appropriate for inclusion, it may be written in various ways: | * Where explicit uncertainty information (such as a [[Wikipedia:Margin of error|margin of error]]) is available and appropriate for inclusion, it may be written in various ways: | ||
: • {{xt|(1.534 ± 0.035) × 10<sup>23</sup> m}} | : • {{xt|(1.534 ± 0.035) × 10<sup>23</sup> m}} | ||
: • {{xt|12.34{{nbsp}}m<sup>2</sup> ± 5%}} (not used with scientific notation) | : • {{xt|12.34{{nbsp}}m<sup>2</sup> ± 5%}} (not used with scientific notation) | ||
: • {{xt|1.604(48) × 10<sup>−4</sup> J}} (equivalent to {{xt|(1.604 ± 0.048) × 10<sup>−4</sup> J}})<ref>The number in parentheses is the numerical value of the standard uncertainty referred to the corresponding last digits of the quoted result – see [http://www.physics.nist.gov/cgi-bin/cuu/Info/Constants/definitions.html NIST – Use of concise notation]</ref> | |||
: • {{xt|1.604(48) × 10<sup>−4</sup> J}} (equivalent to {{xt|(1.604 ± 0.048) × 10<sup>−4</sup> J}})<ref>The number in parentheses is the numerical value of the standard uncertainty referred to the corresponding last digits of the quoted result – | |||
: • {{xt|Polls estimated Jones's share of the vote would be 55 percent, give or take about 3 percent}} | : • {{xt|Polls estimated Jones's share of the vote would be 55 percent, give or take about 3 percent}} | ||
* Where explicit ''uncertainty is unavailable'' (or is unimportant for the article's purposes) round to an appropriate number of [[Wikipedia:Significant digit|significant digits]]; the precision presented should usually be conservative. Precise values (often given in sources for formal or matter-of-record reasons) should be used only where stable and appropriate to the context, or significant in themselves for some special reason. | |||
* Where explicit | |||
: • {{xt|The speed of light is defined to be 299,792,458{{nbsp}}m/s}} | : • {{xt|The speed of light is defined to be 299,792,458{{nbsp}}m/s}} | ||
:: | :: ''but'' {{xt|Particle velocities eventually reached almost two-thirds the 300-million-metre-per-second speed of light.}} | ||
: • {{xt|The city's 1920 population was 10,000}} (not {{!xt|population was 9,996}} | : • {{xt|The city's 1920 population was 10,000}} (not {{!xt|population was 9,996}} - an official figure unlikely to be accurate at full precision) | ||
:: | :: ''but'' {{xt|The town was ineligible because its official census figure (9,996) fell short of the statutory minimum of ten thousand }} (unusual case in which the full-precision official population figure is helpful to readers) | ||
: • {{xt| The accident killed 337 passengers and crew, and three airport workers }} (likely that accurate and precise figures were determined) | : • {{xt| The accident killed 337 passengers and crew, and three airport workers }} (likely that accurate and precise figures were determined) | ||
: • {{xt| At least 800 persons died in the ensuing mudslides }} (unlikely that any precise number can be accurate, even if an official figure is issued) | : • {{xt| At least 800 persons died in the ensuing mudslides }} (unlikely that any precise number can be accurate, even if an official figure is issued) | ||
:: | :: ''or'' {{xt| Officials listed 835 deaths, but the Red Cross said dozens more may have gone unreported }} (in reporting conflicting information, give detail sufficient to make the contrast intelligible) | ||
: • {{xt|The jury's award was $8.5{{nbsp}}million{{nbsp}}...}} (where the actual figure was $8,462,247.63) {{xt| ... | : • {{xt|The jury's award was $8.5{{nbsp}}million{{nbsp}}...}} (where the actual figure was $8,462,247.63) {{xt| ... - reduced on appeal to $3,000,001 (one dollar in [[Wikipedia:Actual damages|actual damages]], the remainder in [[Wikipedia:Punitive damages|punitive damages]])}} | ||
* The number of decimal places should be consistent within a list or context ({{xt|The response rates were 41.0 and 47.4 percent, respectively}}, not {{!xt|41 and 47.4 percent}}), unless different precisions are actually intended. | * The number of decimal places should be consistent within a list or context ({{xt|The response rates were 41.0 and 47.4 percent, respectively}}, not {{!xt|41 and 47.4 percent}}), unless different precisions are actually intended. | ||
* It may sometimes be appropriate to note the | * It may sometimes be appropriate to note the ''lack'' of uncertainty information, especially where such information is normally provided and necessary for full interpretation of the figures supplied. | ||
: • {{xt|A local newspaper poll predicted 52 percent of the vote would go to Smith, but did not publish information on the uncertainty of this estimate}} | : • {{xt|A local newspaper poll predicted 52 percent of the vote would go to Smith, but did not publish information on the uncertainty of this estimate}} | ||
* Avoid using "approximately", "about", and similar terms with figures that have merely been approximated or rounded in a normal and expected way, unless the reader might otherwise be misled. | * Avoid using "approximately", "about", and similar terms with figures that have merely been approximated or rounded in a normal and expected way, unless the reader might otherwise be misled. | ||
: • {{xt|The tallest player was 6 feet 3 inches}} ( | : • {{xt|The tallest player was 6 feet 3 inches}} (not {{!xt|... about 6 feet 3 inches}} - heights are conventionally reported only to the nearest inch, even though greater precision may be available in principle) | ||
:: | :: ''but'' {{xt|The witness said the assailant was about 5 feet 8 inches tall}} ("about" because here the precise value is unknown, with substantial uncertainty) | ||
* The reader may be assumed to interpret large round numbers ({{xt|100,000 troops}}) as approximations. Writing a quantity in words ({{xt|one hundred thousand troops}}) can further emphasize its approximate nature. | * The reader may be assumed to interpret large round numbers ({{xt|100,000 troops}}) as approximations. Writing a quantity in words ({{xt|one hundred thousand troops}}) can further emphasize its approximate nature. | ||
===Non-[[Wikipedia:radix|base]]-10 notations=== | |||
* In computer-related articles, use the prefix <code>0x</code> for hexadecimal, <code>0</code> for octal, and <code>0b</code> for binary, unless there is a strong reason to use some other notation.<ref>The <code>0x</code> and <code>0</code> prefixes, but not <code>0b</code>, are borrowed from the [[Wikipedia:C (programming language)|C programming language]].</ref> Explain these prefixes in the article's introduction or on first use. | |||
* In computer-related articles, use the prefix <code>0x</code> for hexadecimal, <code>0</code> for octal, and <code>0b</code> for binary, unless there is a strong reason to use some other notation.<ref>The <code>0x</code> and <code>0</code> prefixes, but not <code>0b</code>, are borrowed from the [[C (programming language)|C programming language]].</ref> Explain these prefixes in the article's introduction or on first use. | |||
* In all other articles, use <code><sub></code> to create subscripts: {{xt|137<sub>9</sub>}}, {{xt|201<sub>3</sub>}}. Markup: {{xt|137<nowiki><sub>9</sub></nowiki>}}, {{xt|201<nowiki><sub>3</sub></nowiki>}} | * In all other articles, use <code><sub></code> to create subscripts: {{xt|137<sub>9</sub>}}, {{xt|201<sub>3</sub>}}. Markup: {{xt|137<nowiki><sub>9</sub></nowiki>}}, {{xt|201<nowiki><sub>3</sub></nowiki>}} | ||
* For bases above 10, use symbols conventional for that base ( | * For bases above 10, use symbols conventional for that base (e.g. for [[Wikipedia:Base 16|base 16]] use 0{{ndash}}9 and A{{ndash}}F. | ||
==Units of measurement== | ==Units of measurement== | ||
===Unit choice and order=== | ===Unit choice and order=== | ||
Quantities are typically expressed using an appropriate "primary unit", displayed first, followed, when appropriate, by a conversion in parentheses e.g. {{xt | Quantities are typically expressed using an appropriate "primary unit", displayed first, followed, when appropriate, by a conversion in parentheses e.g. {{xt|200 kilometers (120 mi)}}. | ||
In '''all articles''', the primary units chosen will be [[Wikipedia:International System of Units|SI]] units, [[Wikipedia:Non-SI units mentioned in the SI|non-SI units officially accepted for use with the SI]], or such other units as they appear in-game. | |||
===Unit names and symbols=== | ===Unit names and symbols=== | ||
: | :''Definitions:'' | ||
:* Examples of '''unit names''': foot, meter, kilometer. | :* Examples of '''unit names''': foot, meter, kilometer. | ||
:* Examples of '''unit symbols''': ft, m, km. | :* Examples of '''unit symbols''': ft, m, km. | ||
| Line 396: | Line 352: | ||
* In prose, unit names should be given in full if used only a few times, but symbols may be used when a unit (especially one with a long name) is used repeatedly, after spelling out the first use (e.g. {{xt|Up to 15 kilograms of filler is used for a batch of 250{{nbsp}}kg}}). | * In prose, unit names should be given in full if used only a few times, but symbols may be used when a unit (especially one with a long name) is used repeatedly, after spelling out the first use (e.g. {{xt|Up to 15 kilograms of filler is used for a batch of 250{{nbsp}}kg}}). | ||
:* Exception: Certain units<!--<<perhaps identify these in table of specific units elsewhere on this page--> are generally represented by their symbols (e.g. {{xt|°C}} rather than {{!xt|degrees Celsius}}) even on first use, though their unit names may be used for emphasis or clarity ({{xt|automatic conversion of degrees Celsius to degrees Fahrenheit}}). | :* Exception: Certain units<!--<<perhaps identify these in table of specific units elsewhere on this page--> are generally represented by their symbols (e.g. {{xt|°C}} rather than {{!xt|degrees Celsius}}) even on first use, though their unit names may be used for emphasis or clarity ({{xt|automatic conversion of degrees Celsius to degrees Fahrenheit}}). | ||
* Where space is limited, such as in tables, infoboxes, parenthetical notes, and mathematical formulas, unit symbols are preferred. | * Where space is limited, such as in tables, infoboxes, parenthetical notes, and mathematical formulas, unit symbols are preferred. | ||
* Units unfamiliar to general readers should be presented as a name{{ndash}}symbol pair on first use, linking the unit name ({{xt|Energies were originally 2.3 [[ | * Units unfamiliar to general readers should be presented as a name{{ndash}}symbol pair on first use, linking the unit name ({{xt|Energies were originally 2.3 [[Wikipedia:Megaelectronvolts|megaelectronvolts]] (MeV), but were eventually 6{{nbsp}}MeV}}). | ||
* Ranges use unspaced en dash ({{ | * Ranges use unspaced en dash ({{tl|ndash}}) if only one unit symbol is used at the end (e.g. {{xt|5.9{{ndash}}6.3{{nbsp}}kg}}), and spaced en dash ({{tl|snd}}) if two symbols are used (e.g. {{xt|3{{nbsp}}μm - 1{{nbsp}}mm}}); ranges | ||
* Length{{ndash}}width, length{{ndash}}width{{ndash}}height and similar dimensions may be separated by the multiplication sign (<code>×</code> or <code>&times;</code>) or the word | in prose may be specified using either unit symbol or unit names, and units may be stated either after both numerical values or after the last (e.g. {{xt|from 5.9 to 6.3 kilograms}}, {{xt|from 5.9 kilograms to 6.3 kilograms}}, {{xt|from 5.9 to 6.3{{nbsp}}kg}} and {{xt|from 5.9{{nbsp}}kg to 6.3{{nbsp}}kg}} are all acceptable). | ||
* Length{{ndash}}width, length{{ndash}}width{{ndash}}height and similar dimensions may be separated by the multiplication sign (<code>×</code> or <code>&times;</code>) or the word '''by'''. | |||
** With the multiplication sign, each number should be followed by a unit name or symbol (if appropriate): | ** With the multiplication sign, each number should be followed by a unit name or symbol (if appropriate): | ||
:: • {{xt|1{{nbsp}}m × 3{{nbsp}}m × 6{{nbsp}}m}}, not | :: • {{xt|1{{nbsp}}m × 3{{nbsp}}m × 6{{nbsp}}m}}, not {{!xt|1 × 3 × 6 m}}, {{!xt|(1 × 3 × 6){{nbsp}}m}} nor {{!xt|1 × 3 × 6{{nbsp}}m<sup>3</sup>}} | ||
:: • {{xt|a metal plate 1{{nbsp}}ft × 3{{nbsp}}ft × 0.25{{nbsp}}in}} | :: • {{xt|a metal plate 1{{nbsp}}ft × 3{{nbsp}}ft × 0.25{{nbsp}}in}} | ||
:: • {{xt|a railroad [[easement]] 10{{nbsp}}ft × 2.5{{nbsp}}mi}} | :: • {{xt|a railroad [[Wikipedia:Easement|easement]] 10{{nbsp}}ft × 2.5{{nbsp}}mi}} | ||
:* With | :* With '''by''', the unit need be given only once: {{xt|1 by 3 by 6 metres}} or {{xt|1 by 3 by 6 m}} | ||
:* The unspaced letter {{xt|x}} may be used in common terms such as {{xt|[[4x4]]}}. | :* The unspaced letter {{xt|x}} may be used in common terms such as {{xt|[[Wikipedia:4x4|4x4]]}}. | ||
{| class="wikitable" | {| class="wikitable" | ||
|+ General guidelines on unit names and symbols | |+ General guidelines on unit names and symbols | ||
|- | |- | ||
! style="width:40px;" | ! style="width:40px;"|Aspect | ||
! Guideline | ! Guideline | ||
! style="width:40px;" | ! style="width:40px;"| Acceptable | ||
! style="width:40px;" | ! style="width:40px;"| Unacceptable | ||
|- | |- | ||
|rowspan=6|'''Unit names and symbols''' | |rowspan=6|'''Unit names and symbols''' | ||
| | |Unit ''symbols'' are uncapi­tal­ized unless they are derived from a proper name, in which case the first letter (of the base unit symbol, not of any prefix) is capitalized.<ref>These definitions are consistent with all units of measure mentioned in the SI Brochure ''(see previous footnote)'' and with all units of measure catalogued in [[Wikipedia:European units of measurement directives|EU directive 80/181/EEC]] [http://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1397640809938&uri=CELEX:01980L0181-20090527].</ref> | ||
| {{ xt|8 kg}}<br/>{{ xt|100 kPa}} | | {{ xt|8 kg}}<br/>{{ xt|100 kPa}} | ||
| {{!xt|8 Kg}}<br/>{{!xt|100 kpa}} | | {{!xt|8 Kg}}<br/>{{!xt|100 kpa}} | ||
| Line 425: | Line 381: | ||
|{{!xt|38 cm<big>.</big> of rope}} | |{{!xt|38 cm<big>.</big> of rope}} | ||
|- | |- | ||
|Unit | |Unit ''names'' are given in lower case except: where any word would be capital­ized, or where otherwise specified in the SI brochure or this Manual of Style. | ||
| | |||
* {{ xt|He walked several miles.}} | * {{xt|He walked several miles.}}<br> | ||
* {{ xt|Miles of trenches were dug. | * {{xt|Miles of trenches were dug.}} | ||
}} | |||
|{{!xt|A Gallon equals 4{{nbsp}}Quarts.}} | |{{!xt|A Gallon equals 4{{nbsp}}Quarts.}} | ||
|- | |- | ||
|The spelling of certain unit names (some of which are listed in {{section link||Specific units}}, below) varies with the [[ | |The spelling of certain unit names (some of which are listed in {{section link||Specific units}}, below) varies with the [[UniWiki:Manual of Style#National varieties of English|variety of English followed by the article]]. | ||
| | | | ||
| | | | ||
|- | |- | ||
|rowspan=2 | Write unit names and symbols in upright ([[Roman type | |rowspan=2 | Write unit names and symbols in upright ([[Wikipedia:Roman type|roman]]) type, except where emphasizing in context. | ||
| {{ xt|10{{nbsp}}m}}<br/>{{ xt|29 kilograms}} | | {{ xt|10{{nbsp}}m}}<br/>{{ xt|29 kilograms}} | ||
| {{!xt|10{{nbsp}} | | {{!xt|10{{nbsp}}''m''}}<br/>{{!xt|29 ''kilograms''}} | ||
|- | |- | ||
| {{ xt|Thus each two-liter jug contained only two | | {{ xt|Thus each two-liter jug contained only two ''quarts''.}} | ||
| | | | ||
|- | |- | ||
|rowspan=8|'''Numeric values'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | |rowspan=8|'''Numeric values'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | ||
|Do not spell out numbers before unit | |Do not spell out numbers before unit ''symbols''{{nbsp}}... | ||
|{{ xt|12{{nbsp}}min}} | |{{ xt|12{{nbsp}}min}} | ||
|{{!xt|twelve{{nbsp}}min}} | |{{!xt|twelve{{nbsp}}min}} | ||
|- | |- | ||
|...{{nbsp}}but words | |...{{nbsp}}but words ''or'' figures may be used with unit ''names''. | ||
| | |||
* {{ xt|twelve minutes}} | * {{xt|twelve minutes}} | ||
* {{ xt|12 minutes | * {{xt|12 minutes}} | ||
}} | |||
| | | | ||
|- | |- | ||
| Line 459: | Line 413: | ||
| {{!xt|Set the pointer to five.}} | | {{!xt|Set the pointer to five.}} | ||
|- | |- | ||
| Use a nonbreaking space ({{t|nbsp}} or <code>&nbsp;</code>) between a number and a unit | | Use a nonbreaking space ({{t|nbsp}} or <code>&nbsp;</code>) between a number and a unit ''symbol'',{{nbsp}}... | ||
| {{xt|29{{nbsp}}kg}}<br/>(markup: <code>29&nbsp;kg</code> or | | {{xt|29{{nbsp}}kg}}<br/>(markup: <code>29&nbsp;kg</code> or <code><nowiki>29 kg</nowiki></code>) | ||
| style="vertical-align: top"| {{!xt|29kg}} | | style="vertical-align: top"| {{!xt|29kg}} | ||
|- | |- | ||
| ... though with certain symbols ''no'' space is used (see "Specific{{nbsp}}units" table below){{nbsp}}... | | ... though with certain symbols ''no'' space is used (see "Specific{{nbsp}}units" table below){{nbsp}}... | ||
| {{xt|23°}} {{xt|47′}} {{xt|22″}} | |||
| {{!xt|23{{nbsp}}°}} {{!xt|47{{nbsp}}′}} {{!xt|22{{nbsp}}″}} | |||
|- | |- | ||
| ... a normal space is used between a number and a unit | | ... a normal space is used between a number and a unit ''name''. | ||
| {{xt|29{{nbsp}}kilograms}}<br/>(markup: <code>29 kilograms</code>) | | {{xt|29{{nbsp}}kilograms}}<br/>(markup: <code>29 kilograms</code>) | ||
| | | | ||
|- | |- | ||
|To form a value and a unit | |To form a value and a unit ''name'' into a compound adjective use a hyphen or hyphens{{nbsp}}... | ||
| | |||
* {{ xt|a five-day holiday}} | * {{xt|a five-day holiday}} | ||
* {{ xt|a five-cubic-foot box}} | * {{xt|a five-cubic-foot box}} | ||
* {{ xt|a 10-centimeter blade | * {{xt|a 10-centimeter blade}} | ||
}} | |||
| | | | ||
|- | |- | ||
|... but a non-breaking space (never hyphen) separates a value and unit | |... but a non-breaking space (never hyphen) separates a value and unit ''symbol''. | ||
| | |||
* {{ xt|a blade 10 cm long | * {{xt|a blade 10 cm long}} | ||
}} | |||
| {{!xt|a 10-cm blade}} | | {{!xt|a 10-cm blade}} | ||
|- | |- | ||
|rowspan=5| '''Plurals'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | |rowspan=5| '''Plurals'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | ||
|[[International System of Units|SI]] unit | |[[Wikipedia:International System of Units|SI]] unit ''names'' are pluralized by adding the appropriate {{xt|-s}} or {{xt|-es}} suffix{{nbsp}}... | ||
|{{ xt|1 ohm}}; {{xt|10 ohms}} | |{{ xt|1 ohm}}; {{xt|10 ohms}} | ||
| | | | ||
|- | |- | ||
| ... except for these irregular forms. | | ... except for these irregular forms. | ||
| {{ xt|1 henry}}; {{ xt|10 henries}}<br/>{{ xt|1 hertz}}; {{ xt|10 hertz | | {{ xt|1 henry}}; {{xt|10 henries}}<br/>{{xt|1 hertz}}; {{xt|10 hertz}}<br/>{{xt|1 lux}}; {{xt|10 lux}}<br/>{{xt|1 siemens}}; {{xt|10 siemens}} | ||
|{{!xt|10 henrys }}<br/>{{!xt|10 hertzes}}<br/>{{!xt|10 luxes}}<br/>{{nbsp}} | |{{!xt|10 henrys}}<br/>{{!xt|10 hertzes}}<br/>{{!xt|10 luxes}}<br/>{{nbsp}} | ||
|- | |- | ||
|rowspan=2 | Some non-SI units have irregular plurals.<!-- This is meant to be placeholder which perhaps someone can expand (though foot, feet is the only example I can think of at the moment). --> | |rowspan=2 | Some non-SI units have irregular plurals.<!-- This is meant to be placeholder which perhaps someone can expand (though foot, feet is the only example I can think of at the moment). --> | ||
| Line 501: | Line 453: | ||
| {{!xt|10 stratums}} | | {{!xt|10 stratums}} | ||
|- | |- | ||
|Unit | |Unit ''symbols'' (in any system) are identical in singular and plural. | ||
| | |||
* | * {{xt|grew from 1 in to 2 in}} | ||
* | * {{xt|grew from 1 inch to 2 inches}} | ||
* | * {{xt|grew from one to two inches}} | ||
}} | |{{!xt|grew from 1 in to 2 ins}} | ||
|- | |- | ||
|rowspan=5|'''Powers'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | |rowspan=5|'''Powers'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | ||
| Line 514: | Line 465: | ||
|{{!xt|km²}}<br/>(<code><s>km&#178;</s></code>) | |{{!xt|km²}}<br/>(<code><s>km&#178;</s></code>) | ||
|- | |- | ||
|Or use | |Or use '''squared''' or '''cubed''' (''after'' the unit being modified). | ||
|rowspan=2|{{xt|ten metres per second squared}} | |rowspan=2|{{xt|ten metres per second squared}} | ||
|{{!xt|ten metres per squared second}} | |{{!xt|ten metres per squared second}} | ||
|- | |- | ||
|rowspan=2| For areas or volumes only, | |rowspan=2| For areas or volumes only, '''square''' or '''cubic''' may be used (''before'' the unit being modified). | ||
|{{!xt|ten metres per square second}} | |{{!xt|ten metres per square second}} | ||
|- | |- | ||
| Line 524: | Line 475: | ||
| | | | ||
|- | |- | ||
| | | '''sq''' or '''cu''' may be used with US customary or imperial units, but not with [[Wikipedia:International System of Units|SI]] units. | ||
| {{ xt|15{{nbsp}}sq{{nbsp}}mi}}<br/>{{ xt|3{{nbsp}}cu{{nbsp}}ft }} | | {{ xt|15{{nbsp}}sq{{nbsp}}mi}}<br/>{{ xt|3{{nbsp}}cu{{nbsp}}ft }} | ||
| {{!xt|15{{nbsp}}sq{{nbsp}}km}}<br/>{{!xt|3{{nbsp}}cu{{nbsp}}m }} | | {{!xt|15{{nbsp}}sq{{nbsp}}km}}<br/>{{!xt|3{{nbsp}}cu{{nbsp}}m }} | ||
|- | |- | ||
|rowspan=4|'''Products'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | |rowspan=4|'''Products'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | ||
|Indicate a product of unit | |Indicate a product of unit ''names'' with either a hyphen or a space. | ||
| | |||
* {{ xt|foot-pound}} | * {{xt|foot-pound}} | ||
* {{ xt|foot pound}} | * {{xt|foot pound}} | ||
| | |||
* {{!xt|footpound}} | |||
* {{!xt|footpound | |||
* {{!xt|foot·pound}} | * {{!xt|foot·pound}} | ||
|- | |- | ||
|Indicate a product of unit | |Indicate a product of unit ''symbols'' with <code>&[[Wikipedia:middle dot|middot]];</code> or <code>&[[Wikipedia:non-breaking space|nbsp]];</code> | ||
| | | | ||
* {{ xt|ms | * {{xt|ms}} = millisecond | ||
* {{ xt|m·s}} or {{xt|m{{nbsp}}s}} = metre-second | * {{xt|m·s}} or {{xt|m{{nbsp}}s}} = metre-second | ||
| | | | ||
|- | |- | ||
| | |''Exception:'' In some topic areas such as power engineer­ing, certain products take neither space nor <code>&middot;</code>. Follow the practice of reliable sources in the article's topic area. | ||
| | |||
* [[watt hour|{{xt|Wh}}]], [[volt ampere|{{xt|VA}}]], [[ampere hour|{{xt|Ah}}]] | * [[Wikipedia:watt hour|{{xt|Wh}}]], [[Wikipedia:volt ampere|{{xt|VA}}]], [[Wikipedia:ampere hour|{{xt|Ah}}]] | ||
* {{xt|kWh}}, {{xt|MVA}}, {{xt|GAh}} | * {{xt|kWh}}, {{xt|MVA}}, {{xt|GAh}} | ||
| | | | ||
|- | |- | ||
|To pluralize a product of unit | |To pluralize a product of unit ''names'', pluralize only the final unit. (Unit ''symbols'' are never pluralized.) | ||
|{{ xt|ten foot-pounds}} | |{{xt|ten foot-pounds}} | ||
|{{!xt|ten feet-pounds}} | |{{!xt|ten feet-pounds}} | ||
|- | |- | ||
|rowspan=7|'''Ratios,<br />Rates,<br />Densities'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | |rowspan=7|'''Ratios,<br />Rates,<br />Densities'''<!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | ||
|Indicate a ratio of unit | |Indicate a ratio of unit ''names'' with '''per'''. | ||
|{{ xt|meter per second}} | |{{ xt|meter per second}} | ||
|{{!xt|meter/second}} | |{{!xt|meter/second}} | ||
|- | |- | ||
|rowspan=2|Indicate a ratio of unit | |rowspan=2|Indicate a ratio of unit ''symbols'' with a forward slash (<code>/</code>), followed by either a single symbol or a parenthesized product of symbols - do not use multiple slashes. Or use{{nbsp}}<sup>−1</sup>,{{nbsp}}<sup>−2</sup>, etc. | ||
| | |||
* {{ xt|metre per second}} | * {{xt|metre per second}} | ||
* {{ xt|m/s}} | * {{xt|m/s}} | ||
* {{ xt|m·s<sup>−1</sup>}} | * {{xt|m·s<sup>−1</sup>}} | ||
| | |||
* {{!xt|mps}} | * {{!xt|mps}} | ||
|- | |- | ||
| | |||
* {{ xt|kg/(m·s)}} | * {{xt|kg/(m·s)}} | ||
* {{ xt|kg·m<sup>−1</sup>·s<sup>−1</sup>}} | * {{xt|kg·m<sup>−1</sup>·s<sup>−1</sup>}} | ||
| | |||
* {{!xt|kg/m·s}} | * {{!xt|kg/m·s}} | ||
* {{!xt|kg/m/s | * {{!xt|kg/m/s}} | ||
}} | |||
|- | |- | ||
|To pluralize a ratio of unit | |To pluralize a ratio of unit ''names'', pluralize only the numerator unit. (Unit ''symbols'' are never pluralized.) | ||
| | |||
* | * {{xt|ten newton-metres per second}} | ||
* {{xt|10 N·m/s}} | * {{xt|10 N·m/s}} | ||
| | | | ||
|- | |- | ||
|Some of the special forms used in the imperial and US customary systems are shown here{{nbsp}}... | |Some of the special forms used in the imperial and US customary systems are shown here{{nbsp}}... | ||
| | | | ||
* {{ xt|mph}} = miles per hour | * {{xt|mph}} = miles per hour | ||
* {{ xt|mpg}} = miles per gallon | * {{xt|mpg}} = miles per gallon | ||
* {{ xt|psi}} = [[pound (force)| | * {{xt|psi}} = [[Wikipedia:pound (force)|pounds]] per square inch | ||
| | | | ||
|- | |- | ||
|rowspan=2| ... but only the slash or negative exponent notations are used with SI (and other metric) units. | |rowspan=2| ... but only the slash or negative exponent notations are used with SI (and other metric) units. | ||
| | |||
* {{ xt|g/m<sup>2</sup> | * {{xt|g/m<sup>2</sup>}} | ||
* {{ xt|g·m<sup>−2</sup> | * {{xt|g·m<sup>−2</sup>}} | ||
}} | |||
| {{!xt|gsm}} | | {{!xt|gsm}} | ||
|- | |- | ||
| | |||
* {{ xt|km/h | * {{xt|km/h}} | ||
* {{ xt|km·h<sup>−1</sup> | * {{xt|km·h<sup>−1</sup>}} | ||
}} | |||
| {{!xt|kph}} | | {{!xt|kph}} | ||
|- | |- | ||
| Line 612: | Line 551: | ||
|Prefixes should not be separated by a space or hyphen. | |Prefixes should not be separated by a space or hyphen. | ||
|{{ xt|25 kilopascals}} | |{{ xt|25 kilopascals}} | ||
| | |||
* {{!xt|25 kilo pascals}} | * {{!xt|25 kilo pascals}} | ||
* {{!xt|25 kilo-pascals}} | * {{!xt|25 kilo-pascals}} | ||
|- | |- | ||
| Prefixes are added without contraction, | | Prefixes are added without contraction, except as shown here: | ||
| {{ xt|kilohm }}<br/>{{ xt|megohm }}<br/>{{xt|hectare}} | | {{ xt|kilohm }}<br/>{{ xt|megohm }}<br/>{{xt|hectare}} | ||
| {{!xt|kiloohm}}<br/>{{!xt|megaohm}}<br/>{{!xt|hectoare}} | | {{!xt|kiloohm}}<br/>{{!xt|megaohm}}<br/>{{!xt|hectoare}} | ||
|- | |- | ||
|The | |The '''centi-''', '''deci-''', '''deca-''', and '''hecto-''' prefixes should generally be avoided; exceptions include centimetre, decibel, hectolitre, hectare, and hectopascal. | ||
| | |||
* {{ xt|100 metres}} | * {{xt|100 metres}} | ||
* {{ xt|0.1 km | * {{xt|0.1 km}} | ||
}} | |||
|{{!xt|1 hectometre}} | |{{!xt|1 hectometre}} | ||
|- | |- | ||
| Do not use [[wikt:M#Number|{{!xt|M}}]] for 10<sup>3</sup>, {{!xt|MM}} for 10<sup>6</sup>, or {{!xt|B}} for 10<sup>9</sup> (except as noted elsewhere on this page for | | Do not use [[wikt:M#Number|{{!xt|M}}]] | ||
| {{ xt|3 km | for 10<sup>3</sup>, {{!xt|MM}} for 10<sup>6</sup>, or {{!xt|B}} for 10<sup>9</sup> (except as noted elsewhere on this page for '''M''' and '''B''', e.g. [[#Currencies and monetary values|for monetary values]]) | ||
| {{!xt|3 Mm | | {{xt|3 km}}<br/>{{ xt|8 MW}}<br/>{{ xt|125 GeV}} | ||
| {{!xt|3 Mm}}<br/>{{!xt|8 MMW}}<br/>{{!xt|125 BeV}} | |||
|- | |- | ||
|rowspan=4|'''Mixed<br />units'''<!-- ← Use <br /> to make this column as narrow as possible.--><!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | |rowspan=4|'''Mixed<br />units'''<!-- ← Use <br /> to make this column as narrow as possible.--><!-- WARNING! ADJUST ROWSPAN WHEN ADDING/REMOVING ROWS FROM A GROUP OF RULES --> | ||
|rowspan=2| Mixed units are traditionally used with the imperial and US customary systems{{nbsp}}... | |rowspan=2| Mixed units are traditionally used with the imperial and US customary systems{{nbsp}}... | ||
| | |||
* {{xt|a wall 1 ft 1 in thick}} | * {{xt|a wall 1 ft 1 in thick}} | ||
* {{xt|a wall 1 foot 1 inch thick }} | * {{xt|a wall 1 foot 1 inch thick}} | ||
* {{xt|a man 6 feet 2 inches tall}} | * {{xt|a man 6 feet 2 inches tall}} | ||
* {{xt|a 6-foot 2-inch man}} | * {{xt|a 6-foot 2-inch man}} | ||
* {{xt|a 6 ft 2 in man}} | * {{xt|a 6 ft 2 in man}} | ||
| | |||
* {{!xt|1 ft, 1 in}} (no comma) | |||
* | * {{!xt|1 foot, 1 inch}} | ||
* {{!xt|1 foot | |||
* {{!xt|a man 6 foot 2 tall}} | * {{!xt|a man 6 foot 2 tall}} | ||
* {{!xt|a 6-foot 2 man}} | * {{!xt|a 6-foot 2 man}}<br>{{nbsp}} | ||
}} | |||
|- | |- | ||
| | |||
* {{xt|1 US fl pt 8 oz}} | * {{xt|1 US fl pt 8 oz}} | ||
* {{xt|1 US fl pt 8 US fl oz}} | * {{xt|1 US fl pt 8 US fl oz}} | ||
| | | | ||
|- | |- | ||
|... and in expressing time durations{{nbsp}}... | |... and in expressing time durations{{nbsp}}... | ||
| | |||
* {{xt|1:30:07}} | * {{xt|1:30:07}} | ||
* {{xt|1:30}} | * {{xt|1:30}} <ref>Only use this format if it is clear from the context whether this means hours and minutes (H:MM) or minutes and seconds (M:SS).</ref> | ||
* {{xt | * {{xt|1 h 30 min 7 s}} | ||
* {{xt | * {{xt|01<sup>h</sup> 30<sup>m</sup> 07<sup>s</sup>}} <ref>This format is used in astronomy (see the IAU Style Manual for details).</ref> | ||
|| | |||
| | * {{!xt|1:30′07″}} | ||
* {{!xt | * {{!xt|1 hr 30 min 7 sec}} | ||
* {{!xt | * {{!xt|1 h 30 m 7 s}} | ||
* {{!xt | |||
}} | |||
|- | |- | ||
|... but are not normally used in SI. | |... but are not normally used in SI. | ||
| | |||
* {{xt|1.33 m }} | * {{xt|1.33 m }} | ||
* {{xt|133 cm }} | * {{xt|133 cm }} | ||
|{{!xt|1 m 33 cm}} | |{{!xt|1 m 33 cm}} | ||
|} | |} | ||
=== | ====Quantities of bytes and bits==== | ||
In quantities of [[Wikipedia:bit (computing)|bit]]s and [[Wikipedia:Byte|byte]]s, the prefixes '''kilo-''' (symbol '''k''' or '''K'''), '''mega-''' ('''M'''), '''giga-''' ('''G'''), '''tera-''' ('''T'''), etc., are ambiguous. They may be based on a decimal system (like the standard [[Wikipedia:International System of Units|SI]] prefixes), meaning 10<sup>3</sup>, 10<sup>6</sup>, 10<sup>9</sup>, 10<sup>12</sup>, etc., or they may be based on a binary system, meaning 2<sup>10</sup>, 2<sup>20</sup>, 2<sup>30</sup>, 2<sup>40</sup>, etc. The binary meanings are more commonly used in relation to solid-state memory (such as [[Wikipedia:Random-access memory|RAM]]), while the decimal meanings are more common for data transmission rates, disk storage and in theoretical calculations in modern academic textbooks. | |||
| | |||
''' | |||
Follow these recommendations when using these prefixes in UniWiki articles: | |||
Follow these recommendations when using these prefixes in | |||
* Following the SI standard, a lower-case {{xt|k}} should be used for "kilo-" whenever it means 1000 in computing contexts, whereas a capital {{xt|K}} should be used instead to indicate the binary prefix for 1024 according to JEDEC. (If, under the exceptions detailed further below, the article otherwise uses IEC prefixes for binary units, use {{xt|Ki}} instead). | * Following the SI standard, a lower-case {{xt|k}} should be used for "kilo-" whenever it means 1000 in computing contexts, whereas a capital {{xt|K}} should be used instead to indicate the binary prefix for 1024 according to JEDEC. (If, under the exceptions detailed further below, the article otherwise uses IEC prefixes for binary units, use {{xt|Ki}} instead). | ||
* Do not assume that the binary or decimal meaning of prefixes will be obvious to everyone. Explicitly specify the meaning of k and K as well as the primary meaning of M, G, T, etc. in an article | * Do not assume that the binary or decimal meaning of prefixes will be obvious to everyone. Explicitly specify the meaning of k and K as well as the primary meaning of M, G, T, etc. in an article. Consistency within each article is desirable, but the need for consistency may be balanced with other considerations. | ||
* The definition most relevant to the article should be chosen as primary for that article, e.g. specify a binary definition in an article on RAM, decimal definition in an article on [[hard drives]], [[bit | * The definition most relevant to the article should be chosen as primary for that article, e.g. specify a binary definition in an article on RAM, decimal definition in an article on [[Wikipedia:Hard drives|hard drives]], [[Wikipedia:Bit rate|bit rates]], and a binary definition for Windows file sizes, despite files usually being stored on hard drives. | ||
* Where consistency is not possible, specify wherever there is a deviation from the primary definition. | * Where consistency is not possible, specify wherever there is a deviation from the primary definition. | ||
* Disambiguation should be shown in bytes or bits, with clear indication of whether in binary or decimal base. There is no preference in the way to indicate the number of bytes and bits, but the notation style should be consistent within an article. Acceptable examples include: | * Disambiguation should be shown in bytes or bits, with clear indication of whether in binary or decimal base. There is no preference in the way to indicate the number of bytes and bits, but the notation style should be consistent within an article. Acceptable examples include: | ||
: • {{xt|A 64{{nbsp}}MB ( | : • {{xt|A 64{{nbsp}}MB (64 × 1024<sup>2</sup>-byte) video card and a 100{{nbsp}}GB (100 × 1000<sup>3</sup>-byte) hard drive}} | ||
: • {{xt|A 64{{nbsp}}MB ( | : • {{xt|A 64{{nbsp}}MB (64 × 2<sup>20</sup>-byte) video card and a 100{{nbsp}}GB (100 × 10<sup>9</sup>-byte) hard drive}} | ||
: • {{xt|A 64{{nbsp}}MB (67,108,864-byte) video card and a 100{{nbsp}}GB (100,000,000,000-byte) hard drive}} | : • {{xt|A 64{{nbsp}}MB (67,108,864-byte) video card and a 100{{nbsp}}GB (100,000,000,000-byte) hard drive}} | ||
* Avoid inconsistent combinations such as {{!xt|A 64{{nbsp}}MB (67,108,864-byte) video card and a 100{{nbsp}}GB | * Avoid inconsistent combinations such as {{!xt|A 64{{nbsp}}MB (67,108,864-byte) video card and a 100{{nbsp}}GB (100 × 1000<sup>3</sup>-byte)}} hard drive. Footnotes, such as those seen in [//en.wikipedia.org/w/index.php?title=Power_Macintosh_5500&oldid=218088888 Power Macintosh 5500], may be used for disambiguation. | ||
* Unless explicitly stated otherwise, one byte is eight bits | * Unless explicitly stated otherwise, one byte is eight bits ''(see [[Wikipedia:Byte#History|History of "byte"']]). | ||
The [[IEC prefix]] | The [[Wikipedia:IEC prefix|IEC prefixes]] '''kibi-''' (symbol '''Ki'''), '''mebi-''' ('''Mi'''), '''gibi-''' ('''Gi'''), etc., are generally not to be used except:<ref>The UniWiki follows common practice regarding [[Wikipedia:Byte|bytes]] and other data traditionally quantified using [[Wikipedia:Binary prefix|binary prefixes]] (e.g. '''mega-''' and '''kilo-''', meaning 2<sup>20</sup> and 2<sup>10</sup> respectively) and their unit symbols (e.g. '''MB''' and '''KB''') for RAM and [[Wikipedia:Decimal prefix|decimal prefixes]] for most other uses. Despite the IEC's 1998 international standard creating several new binary prefixes (e.g. mebi-, kibi-) to distinguish the meaning of the decimal [[Wikipedia:SI prefix|SI prefixes]] (e.g. '''mega-''' and '''kilo-''', meaning 10<sup>6</sup> and 10<sup>3</sup> respectively) from the binary ones, and the subsequent incorporation of these IEC prefixes into the [[Wikipedia:IEC 80000-13|ISO/IEC 80000]], consensus on Wikipedia in computing-related contexts currently favours the retention of the more familiar but ambiguous units '''KB''', '''MB''', '''GB''', '''TB''', '''PB''', '''EB''', etc. over use of unambiguous IEC binary prefixes.</ref> | ||
* when the majority of cited sources on the article topic use IEC prefixes; | * when the majority of cited sources on the article topic use IEC prefixes; | ||
* in a direct quote using the IEC prefixes; | * in a direct quote using the IEC prefixes; | ||
| Line 921: | Line 630: | ||
* in articles in which both types of prefix are used with neither clearly primary, or in which converting all quantities to one or the other type would be misleading or lose necessary precision, or declaring the actual meaning of a unit on each use would be impractical. | * in articles in which both types of prefix are used with neither clearly primary, or in which converting all quantities to one or the other type would be misleading or lose necessary precision, or declaring the actual meaning of a unit on each use would be impractical. | ||
== | ==Currencies and monetary values== | ||
===Choice of currency=== | ===Choice of currency=== | ||
* In '''country-specific articles''', such as [[Economy of Australia]], use the currency of the subject country. | * In '''country-specific articles''', such as [[Wikipedia:Economy of Australia|Economy of Australia]], use the currency of the subject country. | ||
* In '''non-country-specific articles''' such as [[Wealth]], use US dollars ({{xt|$123}}), euros ({{xt|€123}}), or pounds sterling ({{xt|£123}}). | * In '''non-country-specific articles''' such as [[Wikipedia:Wealth|Wealth]], use US dollars ({{xt|$123}}), euros ({{xt|€123}}), or pounds sterling ({{xt|£123}}). | ||
===Currency names=== | ===Currency names=== | ||
* Do not capitalize the names or denominations of currencies, currency subdivisions, coins and banknotes: not {{!xt|a Five-Dollar bill, four Quarters, and one Penny total six Dollars one Cent}} but {{xt|a five-dollar bill, four quarters, and one penny total six dollars one cent}}. ''Exception:'' where otherwise required, as at the start of a sentence or in such forms as {{xt| | * Do not capitalize the names or denominations of currencies, currency subdivisions, coins and banknotes: not {{!xt|a Five-Dollar bill, four Quarters, and one Penny total six Dollars one Cent}} but {{xt|a five-dollar bill, four quarters, and one penny total six dollars one cent}}. ''Exception:'' where otherwise required, as at the start of a sentence or in such forms as {{xt|Interstellar Kredits}}. | ||
* To pluralize | * To pluralize '''euro''' use the standard English plurals ({{xt|ten euros and fifty cents}}), not the [[Wikipedia:Linguistic issues concerning the euro#English|invariant plurals used for European Union legislation and banknotes]] ({{!xt|ten euro and fifty cent}}). For the adjectival form, use a hyphenated singular: ({{xt|a two-euro pen and a ten-cent coin}}). | ||
===Currency symbols=== | ===Currency symbols=== | ||
* In general, the first mention of a particular currency should use its full, unambiguous signifier (e.g. {{xt|A$52}}), with subsequent references using just the appropriate symbol (e.g. {{xt|$88}}), unless this would be unclear. | * In general, the first mention of a particular currency should use its full, unambiguous signifier (e.g. {{xt|A$52}}), with subsequent references using just the appropriate symbol (e.g. {{xt|$88}}), unless this would be unclear. ''Exceptions:'' | ||
:* In an article referring to multiple currencies represented by the same symbol (e.g. the dollars of the US, Canada, Australia, New Zealand, and other countries | :* In an article referring to multiple currencies represented by the same symbol (e.g. the dollars of the US, Canada, Australia, New Zealand, and other countries - ''see [[Wikipedia:Currency symbols#dollar variants|Wikipedia:Dollar variants'') use the full signifier (e.g. {{xt|US$}}, {{xt|A$}}) each time, except (possibly) where a particular context makes this both unnecessary and undesirable. | ||
:* In articles entirely on EU-, UK- and/or US-related topics, all occurrences may be shortened ({{xt|€26}}, {{xt|£22}} or {{xt|$34}}), unless this would be unclear. | :* In articles entirely on EU-, UK- and/or US-related topics, all occurrences may be shortened ({{xt|€26}}, {{xt|£22}} or {{xt|$34}}), unless this would be unclear. | ||
* The [[pound sterling]] is represented by the {{xt|£}} symbol, with one horizontal bar. The double-barred {{!xt|₤}} symbol is ambiguous, as it has also been used for the [[Italian lira]] and other currencies. For non-British currencies that use pounds or a pound symbol (e.g. the [[Irish pound]], IR£) use the symbol conventionally preferred for that currency. | * The [[Wikipedia:Pound sterling|pound sterling]] is represented by the {{xt|£}} symbol, with one horizontal bar. The double-barred {{!xt|₤}} symbol is ambiguous, as it has also been used for the [[Wikipedia:Italian lira|Italian lira]] and other currencies. For non-British currencies that use pounds or a pound symbol (e.g. the [[Wikipedia:Irish pound|Irish pound]], IR£) use the symbol conventionally preferred for that currency. | ||
* If there is no common English abbreviation or symbol, follow the [[ISO 4217]] standard. | * If there is no common English abbreviation or symbol, follow the [[Wikipedia:ISO 4217|ISO 4217]] standard. ''See also [[Wikipedia:List of circulating currencies|List of circulating currencies]].'' | ||
=== | ===Formatting=== | ||
* A period (full stop, <code>.</code>) is used as the decimal point | * A period (full stop, <code>.</code>) is used as the decimal point - never a comma ({{xt|$6.57}}, not {{!xt|$6,57}}). | ||
* | * ''For the grouping of digits (e.g. {{xt|£1,234,567}}) see {{section link||Grouping of digits}}, above.'' | ||
* Do not place a currency symbol | * Do not place a currency symbol ''after'' the accompanying numeric figures (e.g. {{!xt|123$}}, {{!xt|123£}}, {{!xt|123€}}) unless that is the normal convention for that symbol when writing in English: {{xt|smaller British coins include 1p, 2p, and 5p denominations}}. Never use forms such as {{!xt|$US123}} or {{!xt|$123 (US)}}. | ||
* Currency abbreviations that come before the numeric value are | * Currency abbreviations that come before the numeric value are ''unspaced'' if they consist of a nonalphabetic symbol only, or end in a symbol ({{xt|£123}};{{nbsp}}{{nbsp}} {{xt|€123}}); but ''spaced'' | ||
if alphabetic ({{xt|R{{nbsp}}75}}). | |||
* Ranges should be expressed giving the currency signifier just once: {{xt|$250{{ndash}}300}}, not {{!xt|$250{{ndash}}$300}}. | * Ranges should be expressed giving the currency signifier just once: {{xt|$250{{ndash}}300}}, not {{!xt|$250{{ndash}}$300}}. | ||
* {{xt|million}} and {{xt|billion}} should be spelled out on first use, and (optionally) abbreviated {{xt|M}} or {{xt|bn}} (both unspaced) thereafter: {{xt|She received £70 million and her son £10M}}; {{xt|the school's share was $250{{ndash}}300 million, and the charity's $400{{ndash}}450M}}. | * {{xt|million}} and {{xt|billion}} should be spelled out on first use, and (optionally) abbreviated {{xt|M}} or {{xt|bn}} (both unspaced) thereafter: {{xt|She received £70 million and her son £10M}}; {{xt|the school's share was $250{{ndash}}300 million, and the charity's $400{{ndash}}450M}}. | ||
* In general, a currency symbol should be accompanied by a numeric amount e.g. not {{!xt|He converted his US$ to A$}} but {{xt|He converted his US dollars to Australian dollars}} or {{xt|He exchanged the US$100 note for Australian dollars}}. | * In general, a currency symbol should be accompanied by a numeric amount e.g. not {{!xt|He converted his US$ to A$}} but {{xt|He converted his US dollars to Australian dollars}} or {{xt|He exchanged the US$100 note for Australian dollars}}. | ||
:* Exceptions may occur in tables and infoboxes where space is limited e.g. {{xt|Currencies accepted for deposit: [[United States dollar|US$]], [[Swiss franc|SFr]], [[British pound|GB£]], [[Euro|€]]}}. It may be appropriate to wikilink such uses, or add an explanatory note. | :* Exceptions may occur in tables and infoboxes where space is limited e.g. {{xt|Currencies accepted for deposit: [[Wikipedia:United States dollar|US$]], [[Wikipedia:Swiss franc|SFr]], [[Wikipedia:British pound|GB£]], [[Wikipedia:Euro|€]]}}. It may be appropriate to wikilink such uses, or add an explanatory note. | ||
===Conversions=== | ===Conversions=== | ||
* Conversions of | * Conversions of ''less-familiar currencies'' may be provided in terms of more familiar currencies - such as the US dollar, euro or pound sterling - using an appropriate rate (which is often ''not'' the current exchange rate). Conversions should be in parentheses after the original currency, rounding to avoid [[Wikipedia:False precision|false precision]] (two significant digits is usually sufficient, as most exchange rates fluctuate significantly), with at least the year given as a rough point of conversion rate reference; e.g. {{xt|Since 2001 the grant has been 10,000,000 [[Wikipedia:Swedish krona|Swedish kronor]] ($1.4M, €1.0M, or £800k, not {{!xt|($1,390,570, €971,673 or £848,646)}}. | ||
* For | * For ''obsolete currencies'', provide an equivalent (formatted as a conversion) if possible, in the modern replacement currency (e.g. decimal pounds for historical pre-decimal pounds-and-shillings), or a US-dollar equivalent where there is no modern equivalent. | ||
* In some cases it may be appropriate to provide a conversion accounting for inflation or deflation over time. | * In some cases it may be appropriate to provide a conversion accounting for inflation or deflation over time. | ||
==Common mathematical symbols== | |||
* The ''Insert'' menu below the editing window gives a more complete list of math symbols, and allows symbols to be inserted without the HTML encoding (e.g. <code>&divide;</code>) shown here. | * The ''Insert'' menu below the editing window gives a more complete list of math symbols, and allows symbols to be inserted without the HTML encoding (e.g. <code>&divide;</code>) shown here. | ||
* Spaces are placed to left and right when a symbol is used | * Spaces are placed to left and right when a symbol is used [[Wikipedia:binary operation|with two operands]]}}, but no space is used when [[Wikipedia:unary operation |there is one operand]]}}. | ||
* Use | * Use {{tag|var}} for variable names: <code><nowiki><var>base</var> + <var>ht</var></nowiki></code> produces <var>base</var> + <var>ht</var>. | ||
* The {{ | * The {{tl|nbsp}} template may be used to prevent awkward linebreaks. | ||
{|class="wikitable" style="align: center; text-align: center;" | {|class="wikitable" style="align: center; text-align: center;" | ||
|+Common mathematical symbols | |+Common mathematical symbols | ||
| Line 973: | Line 679: | ||
! Comments | ! Comments | ||
|- | |- | ||
| rowspan=2| [[Plus sign|Plus /<br />positive]] | | rowspan=2| [[Wikipedia:Plus sign|Plus /<br />positive]] | ||
| | | <var>x</var> + <var>y</var> | ||
| <code> | | <code><nowiki><nowiki><var>x</var> + <var>y</var></nowiki></nowiki></code> | ||
| rowspan=2| | | rowspan=2| | ||
|- | |- | ||
| + | | +<var>y</var> | ||
| <code>+ | | <code><nowiki><nowiki>+<var>y</var></nowiki></nowiki></code> | ||
|- | |- | ||
| rowspan=2|[[Minus sign|Minus /<br />negative]] | | rowspan=2|[[Wikipedia:Minus sign|Minus /<br />negative]] | ||
| | | <var>x</var> − <var>y</var> | ||
| <code> | | <code><nowiki><var>x</var> &minus; <var>y</var></nowiki></code> | ||
| rowspan=2|Do not use hyphen ({{!xt|<code>-</code>}}) or dashes ({{!xt|{{ | | rowspan=2|Do not use hyphen ({{!xt|<code><nowiki>-</nowiki></code>}}) or dashes (–, {{!xt|{{tl|ndash}}}}, or {{!xt|—}}). | ||
|- | |- | ||
| − | | −<var>y</var> | ||
| <code>&minus; | | <code><nowiki>&minus;<var>y</var></nowiki></code> | ||
|- | |- | ||
| rowspan=2| [[Plus-minus sign|Plus-minus /<br />minus-plus]] | | rowspan=2| [[Wikipedia:Plus-minus sign|Plus-minus /<br />minus-plus]] | ||
| 41.5 ± 0.3 | | 41.5 ± 0.3 | ||
| <code>41.5 &plusmn; 0.3</code> | | <code><nowiki>41.5 &plusmn; 0.3</nowiki></code> | ||
| rowspan=2| | | rowspan=2| | ||
|- | |- | ||
| | | −(±<var>a</var>) = ∓<var>a</var> }} | ||
| | | <code><nowiki>&minus;(&plusmn;<var>a</var>) = &#8723;<var>a</var></nowiki></code> }} | ||
|- | |- | ||
| [[Multiplication sign|Multiplication]],<br />cross | | [[Wikipedia:Multiplication sign|Multiplication]],<br />cross | ||
| | | <var>x</var> × <var>y</var> | ||
| <code> | | <code><nowiki><var>x</var> &times; <var>y</var></nowiki></code> | ||
| Do not use the letter {{!xt|x}} to indicate multiplication. However, an | | Do not use the letter {{!xt|x}} to indicate multiplication. However, an ''unspaced'' {{xt|x}} may be used as a substitute for "by" in common terms such as [[Wikipedia:4x4|{{xt|4x4}}]]. | ||
|- | |- | ||
| [[Division sign|Division]], obelus | | [[Wikipedia:Division sign|Division]], obelus | ||
| | | <var>x</var> ÷ <var>y</var> | ||
| <code> | | <code><nowiki><var>x</var> &divide; <var>y</var></nowiki></code> | ||
| rowspan=8| | | rowspan=8| | ||
|- | |- | ||
| [[Equal sign|Equal / equals]] | | [[Wikipedia:Equal sign|Equal / equals]] | ||
| | | <var>x</var> = <var>y</var> | ||
| <code> | | <code><nowiki><var>x</var> = <var>y</var></nowiki></code> | ||
|- | |- | ||
| [[Not equal sign|Not equal]] | | [[Wikipedia:Not equal sign|Not equal]] | ||
| | | <var>x</var> ≠ <var>y</var> | ||
| <code> | | <code><nowiki><var>x</var> &ne; <var>y</var></nowiki></code> | ||
|- | |- | ||
| [[Approximate sign|Approx. equal]] | | [[Wikipedia:Approximate sign|Approx. equal]] | ||
| | | π ≈ 3.14 | ||
| <code>{{tlx|pi}} &asymp; 3.14</code><!-- should the pi be italic? --> | | <code><nowiki>{{tlx|pi}} &asymp; 3.14</nowiki></code><!-- should the pi be italic? --> | ||
|- | |- | ||
| [[Less than sign|Less than]] | | [[Wikipedia:Less than sign|Less than]] | ||
| | | <var>x</var> < <var>y</var> | ||
| <code> | | <code><nowiki><var>x</var> &lt; <var>y</var></nowiki></code> | ||
|- | |- | ||
| [[Less than or equal to|Less or equal]] | | [[Wikipedia:Less than or equal to|Less or equal]] | ||
| | | <var>x</var> ≤ <var>y</var> | ||
| <code> | | <code><nowiki><var>x</var> &le; <var>y</var></nowiki></code> | ||
|- | |- | ||
| [[Greater than sign|Greater than]] | | [[Wikipedia:Greater than sign|Greater than]] | ||
| | | <var>x</var> > <var>y</var> | ||
| <code> | | <code><nowiki><var>x</var> &gt; <var>y</var></nowiki></code> | ||
|- | |- | ||
| [[Greater than or equal to|Greater or equal]] | | [[Wikipedia:Greater than or equal to|Greater or equal]] | ||
| | | <var>x</var> ≥ <var>y</var> | ||
| <code> | | <code><nowiki><var>x</var> &ge; <var>y</var></nowiki></code> | ||
|} | |} | ||
==See also== | ==See also== | ||
* [[Wikipedia:Naming conventions (numbers and dates)]] | * [[Wikipedia:Wikipedia:Naming conventions (numbers and dates)|Wikipedia:Naming conventions (numbers and dates)]] | ||
* [[Wikipedia:Date formattings]] | * [[Wikipedia:Wikipedia:Date formatting|Wikipedia:Date formattings]] | ||
* [ | * [https://meta.wikimedia.org/wiki/Help:Date_formatting_and_linking Help:Date formatting and linking] at Meta-Wiki | ||
* | * [https://meta.wikimedia.org/wiki/Help:Calculation#Displaying_numbers_and_numeric_expressions Help:Displaying numbers and numeric expressions] at Meta-Wiki | ||
==Notes and references== | ==Notes and references== | ||
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