When I'm communicating with the table or making a call, I use the proper mechanics. But I don't have a problem with a signal such as the hand tip as a communication tool between officials. When we have less than one minute to play in a quarter, we raise one finger to acknowledge that we are aware of the clock. That's not in the book either. Some guys tap their head, which I think looks really stupid.
I don't use the psuedo signals such as "full TO," "not closely guarded," "kicking the ball," or "she got all ball."
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