In American football, an signal is when the QB, just before the start of the play, changes the selected play at the line of contact. Essentially, it's a last-minute adjustment! The player might notice something on the https://xem-bng-trc-tip-ko-nh-ci355228.pointblog.net/the-defines-an-signal-in-the-nfl-an-easy-look-95083081