In the game of football, an signal is when the quarterback, just before the beginning of the play, changes the selected play at the line of scrimmage. Essentially, it's a immediate adjustment! The QB might notice https://xem-bng-trc-tip-ko-nh-ci026527.mybuzzblog.com/22203963/the-is-an-play-call-in-the-nfl-a-simple-look