In American football it could be the position of the player called the kicker.
A linebacker is a player in American Football
Line Backer is an American football position. It is a defensive position.
Any one that you're good at!
In American football, 'S' is a safety. In association football, 'S' may be used for striker.
There is no such position in baseball. The running back position is used in American football.
No. The quarterback is a position in American (NFL-style) Football.
In American football, that is when the quarterback is directly behind the center with his hands in position to take the snap.