THey are present for the various players that are part of the teams - if you mouseover it, the tool tip will tell you what teams that player is a part of. If you are not part of any team, you don't get anything.
Year 12 Day 209 20:03
Deleted by Tez Falloy. Reason: Second question popped in my head related to this one
Ah do oyu mean sigs? If so then there is an option to add a sig in the CHaracter pages, though making it too big will bring the wrath of the admins on you. WHenever you reply there is a SHow Signature tickbox, and for me at least its automatically ticked.