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The relative positions of American football officials in a seven-official system: The Referee (R) positions himself behind the offensive team, favoring the right side if the quarterback is a right-handed passer. The Umpire (U) stands behind the defensive line and linebackers. The Head Linesman (H) stands at one end of the line of scrimmage.
A pair of officials at a Maryland high school football game in September 2008. White knickers used to be worn by officials; black trousers are now standard.. For ease of recognition, officials are usually clad in a black-and-white vertically striped shirt and black trousers with a thin white stripe down the side (this was formerly white knickers with black/white striped stirrup stockings or ...
The Umpire (U) stands behind the defensive line and linebackers. The Head Linesman (H) stands at one end of the line of scrimmage. The Line Judge (L) stands at the other end of the line of scrimmage. The Field Judge (F) works downfield behind the defensive secondary on the same sideline as the Line Judge.
A diagram showing an I formation on offense and a 4-3 formation on defense In American football , the specific role that a player takes on the field is referred to as their position. Under the modern rules of American football, both teams are allowed 11 players [ 1 ] on the field at one time and have "unlimited free substitutions", meaning that ...
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A 1904 diagram of an American football field. In this period, lines were painted along the length of the field as well as the width, making a grid pattern. The sport is typically known as simply "football" in the countries where it originated, regardless of the specific variety. [4]
In football, the formation describes how the players in a team are positioned on the field. Many variations are possible on both sides of the ball, depending on the strategy being employed. On offense, the formation must include at least seven players on the line of scrimmage , including a center to start the play by snapping the ball.