Actually, that would be the 0,0,1 pixel on a 0,0,0 background that is supposed to represent you. That is, if you yourself are half as difficult to spot as the rest of your species.
(Background information: the Trithians use the stock shipset whose name begins with P and that can be fairly difficult to spot, particularly their Escorts. You'd better have a keen eyesight or keep a check for every single vessel and check where it's headed.)