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Besides charge/block/team control calls, I don't give preliminary signals unless it's necessary.
Like... say A1 is trying for a layup, and B1 goes up with him. While both players are in the air B1 commits a foul due to his body going into A1... instead of for illegal contact with the hand(s)/arm(s). I will give a push signal to let the defender, and others, know right away it was not involving the hands, so as to avoid the coach or player saying something like "he/I blocked that shot cleanly".
Most of the time I have a fist in the air, and then I'll put fingers in the air for free throws, or point to the spot of the throw-in. That way, by the time I'm finished reporting, we're ready to get the game moving again.
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