The quarterback tells the other players, with signals, what the next play will be Signals are also used at the line of scrimmage to tell the center when to snap the ball
The words used by the quarterback in the huddle to inform the other players as to the formation and play to be used on the upcoming down The quarterback also uses signals at the line of scrimmage to instruct the center when to snap the ball
Signals are used in state models to initiate a transition from one state into another transitions The transition statement specifies the transition from one state to another when a certain signal is received