A colloquial term in football that refers to the position of quarterback.
The quarterback is sometimes known as the "signal caller" because he is responsible for calling plays at the line of scrimmage. Although most plays are preceded by a huddle during which the quarterback relays the chosen play to his teammates, quarterbacks will call out coded signals and often make hand motions indicating the agreed play or any changes he chooses to make at the line of scrimmage before the snap.