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American football positions. 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 on the field at one time and have "unlimited free substitutions", meaning that they may change any number of players during any ...
Lineman (gridiron football) A diagram of the linemen, with defensive linemen (in 4-3 formation) in red and offensive linemen in green. In gridiron football, a lineman is a player who specializes in play at the line of scrimmage. The linemen of the team currently in possession of the ball are the offensive line, while linemen on the opposing ...
Hash mark (sports) In sports, a hash mark or hash line is a short line/ bar marking that is painted perpendicular to the sidelines or side barricades, used to help referees and players recognize on-field locations and visually measure distances. Hash marks serve the same function as the graduated markings on measuring tools such as rulers .
When the "football field" is used as unit of measurement, it is usually understood to mean 100 yards (91.44 m), although technically the full length of the official field, including the end zones, is 120 yards (109.7 m). The total area of the field is 57,600 sq ft or 5,350 m 2. There is a goal centered on each end line, with a crossbar 10 feet ...
A line of scrimmage is parallel to the goal lines and touches one edge of the ball where it sits on the ground before the snap. In American football, the set distance of the line of scrimmage between the offense and defense is 11 inches (28 cm), the length of the ball. In Canadian football, the set distance of the line of scrimmage is 1 yard ...
Chain crew. In gridiron football, the chain crew (commonly known as the " chain gang ") is a crew that manages signal poles on one of the sidelines. There are three primary signal poles: the "rear rod" that marks the beginning of the current set of downs, the "forward rod" that marks the line to gain, and the "box" that marks the line of ...
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