Let's go with play No. 45: "G [Gun] BROWN RT [Right] 74 HOSS X-FOLLOW" Those six components establish the formation, the pass protection, and the routes the receivers are to run. Formation: "Gun ...

Situations like that are one reason a few coaches such as the 49ers' Kyle Shanahan don’t allow their quarterbacks to wear wristbands. He gives his quarterback the whole play call via the headset.