There are seven officials in an NFL game:
The referee is the head official and has the final say with all rulings on the field. If there is a disagreement between officials, the referee will step in and make the decision.
Football Flag Throw
If a flag is thrown onto the field in football, fans and players refer to this as: A flag was thrown on the play.
Football Referee Signals
A referee signal is a way that the officials communicate with teams and fans during a game. After a flag is thrown, officials will signal the reason for the flag. The referee will use his hands to define the penalty as he makes an announcement.