Dust 514: Fitting
From EVE University Wiki
Fitting your Dropsuit and Vehicles
Fitting Screen
Like Eve, the fitting screen is where you prepare your Dropsuit or Vehicles for combat. In the way that ships in Eve have CPU and Powergrid (PG) capacities so do Mercenary Dropsuits and the attack Vehicles they use. There is no capacitor to worry about
Each one has High and Low Slots for modules which effect the abilities of the Dropsuit. There are also slots for weapons and equipment such as Repair Tools or Nano-hives.
In the above picture the suit being shown has two High Slots on the upper left and one Low Slot on the upper right.