Our wings signal off the line, but no signal needed if on the line. As a backjudge, I like to read the off the line signal by a wing to help me determine which of the ends is eligible as a TE if there are two TE's. My depth perception can't always tell. (The TE that is 'covered up' is not eligible and I can be aware of that too.)
If there are not enough players on A's line, the wings will point at each other to help each other recognize that fact.
Also, in a short yardage situation where the wings move in to better observe the play and forward progress for the spot, they will signal with two fists moving together to 'pinch' in as a reminder of the situation.
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