In the game of football, an signal is when the QB, just before the start of the play, changes the pre-determined play at the line of engagement. Essentially, it's a last-minute adjustment! The quarterback might notice https://xem-bng-trc-tip-ko-nh-ci318831.digitollblog.com/42029316/the-represents-an-play-call-in-the-nfl-an-easy-guide