Template documentation (for the above template, sometimes hidden or invisible)
{{Zwsp}} inserts the code ​ literally, which produces a "Zero width space" in the rendered wiki-page.
Usage
This is a convenience template for the zero-width space character, U+200B (​).
It is completely invisible in display, but has the effect of acting as a multi-line breaking point for text inside a word that otherwise would not break. Whitespace and normal dashes (-) are already multi-line breakpoints, but this template allows the special insertion of invisible breakpoints inside words.
The zero-width space character has a higher breaking priority than the dash character (-), so when using it in a phrase with dashes, it is recommended to place a zero-width space immediately after each dash as well.
(documentation copied from the English wikipedia)