From the NFHS Manual (under "Guidance on Signaling Player's Numbers" after all the number information):
It is important to not create confusion with signaling illegal multiple contact ("2") or 4 hits ("4"). R1 should hold the player number signal in an area not used to show a foul involving number of player contacts. This could be at should height and slightly to the side of the offending team as opposed to head height where "2-hit" and "4-hit" signals are to be held.
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