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The chain gang. 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 scrimmage.
Per the league, a tracking system is installed at every NFL stadium that includes "20-30 ultra-wide band receivers," "2-3 radio-frequency identification (RFID) tags installed into the players ...
A sideline official holding a dicker-rod during the 1974 World Football League season; running with the football is quarterback Dave Mays. The dicker-rod (also spelled dickerod) is a device intended to replace the first down chains commonly used to measure 10-yard distances during games of gridiron football.
Personnel groupings are groups of players used in American football to identify the different types of skill position players on the field of play for an offense. Personnel groupings, also known as personnel packages, are commonly denoted using a two-digit numerical system that identifies the type of offensive personnel, and the number of each type of personnel. [1]
Diagram of a modern American football field. Diagram of an early 20th century version of an American football field. The rectangular field of play used for American football games measures 100 yards (91.44 m) long between the goal lines, and 160 feet (48.8 m) (53.3 yards) wide. The field may be made of grass or artificial turf. In addition ...
The NFL's six wild-card games feature some potentially entertaining affairs – and maybe a few duds along the way to boot.
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A route tree for a receiver on the left side of the offense. A route is a pattern or path that a receiver in gridiron football runs to get open for a forward pass. [1] Routes are usually run by wide receivers, running backs and tight ends, but other positions can act as a receiver given the play.