In American football, an signal is when the QB, just before the start of the play, changes the pre-determined play at the line of scrimmage. Essentially, it's a last-minute adjustment! The quarterback might notice https://xem-bng-trc-tip-ko-nh-ci353299.link4blogs.com/62954117/a-is-an-play-call-in-the-nfl-a-look