Set

[JugglingReferee]

Originally Posted by Bullycon

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.

This is also the Canadian ruling, with the exception that it's a 10-yard OC foul.