OK, that is a good one!
WTF is it? All I can see is a little bluish smudge on a black square.
(Mind you, this monitor's always been a bit iffy on images with a lot of dark in them)
It's the famous close-up of Riker's rank pips (three of them) from TNG's "Cause and Effect," and the underlying answer to the mystery of the recurring three's, the secret of the code Data sent to himself back into the causality loop!