This is just a little "trick" to sort your task groups in a more usefull manner.
Task Groups are ordered (on the F12 screen) alphabetical. This is all nice and fine, but using 1st Battle Squadron and 2nd Battle Squadron, for example, will have 1st Fright Group and 1st Colony Group intermixed with those combat groups.
To avoid this, I name the groups name/number, i.e. Battle Squadron 1, Battles Squadron 2. Now all Battle Squadron will be listed one after the other.
This still puts Colony Group 1 between the Battle Squadrons and Destroyer Sqadron 1, however.
To avoid even this, I put <Space> in front.
The shipyard group will get three spaces in front, so it will allways be the first on the list.
Regular combat groups, that will receive orders regularly, get two spaces
FAC groups get one space and everything else gets no space.