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					Originally Posted by Trap  Trying to deceive defense.  unsportsman like act??   Is there any rule(s) on who can yell out things during a play? | 
	
 The defense may not give signals that interfere with the offense's signals.  (e.g. a DL yelling "Hut!")  That results in a 15-yard Unsportsmanlike Conduct penalty.  Other than that, there are no restrictions on who may call verbal signals.
The offense may be penalized for a false start if they commit any act clearly intended to cause the defense to encroach.  A player yelling "Set!" would not normally qualify.