Rule 7 – Section 1 – Article 5 – Defensive Team Requirements
a. Each of the following (1-5) is a dead-ball foul. Officials should blow the whistle and not allow the play to continue. After the ball is ready for play and before the ball is snapped:
- No player shall use words or signals that disconcert opponents when they are preparing to put the ball in play. No player may call defensive signals that simulate the sound or cadence of, or otherwise interfere with, offensive starting signals.
PENALTY − [4-5] Dead ball foul, delay of game. Five yards from the succeeding spot [S21: DOD].