"Unofficial" signals

Originally Posted by BadNewsRef

Had a conference clinic today. Rules interpreter told us that on illegal screen calls we need to use any signal we can think of that most accurately describes the act when reporting to the table.

Back on track! College I presume?

I've been told not to do the "hook 'em horns" signal, but rather the "two index fingers" to signal single bonus. However, during play (perhaps when one team is stalling for final shot), I find the horns signal is much quicker.

As someone else mentioned the "last shot" signal is unofficial but should be essential. Here we just pat our chest, how is it done in other areas?