Player Raising His/Her Hand When They Commit a Foul

[Freddy]

Originally Posted by BillyMac

From the IAABO mechanics manual (page 52, A, 4) When clarification is necessary, extend the other arm, with palm down, toward the fouler's midsection. I don't have access to a NFHS manual.

NFHS 2.4.2.B.1. - "When clarification is needed, delay and extend the other hand, palm down toward the fouling player's hips (bird-dog signal)." And the faceless Mr. Pictograph guy at the back of the books shows illustration #5, the pic with the "stop clock for foul", with the parenthetical phrase "optional bird dog".
Don't see it much here, only when clarification is indeed necessary.