In American football, an signal is when the QB, just before the snap of the play, changes the pre-determined play at the line of engagement. Essentially, it's a immediate adjustment! The QB might notice something on https://xem-bng-trc-tip-ko-nh-ci929081.blogproducer.com/49931557/the-defines-an-play-call-in-the-nfl-an-easy-guide