In American and Canadian football, a single-wing formation was a precursor to the modern shotgun formation. The term usually connotes formations in which the snap is tossed rather than handed. Formati
A classic single-wing alignment, with the center (50) shotgun-snapping the ball either to the left halfback/"tailback" (40) or to the fullback (30). Quarterback (20) is called "blocking back" in this formation, right halfback (10) is the "wingback," frequently a pass receiver.