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2. American football positions - Wikipedia

   en.wikipedia.org/wiki/American_football_positions

   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 ...

3. Hash mark (sports) - Wikipedia

   en.wikipedia.org/wiki/Hash_mark_(sports)

   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 .

4. American football field - Wikipedia

   en.wikipedia.org/wiki/American_football_field

   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 ...

5. Kickoff (gridiron football) - Wikipedia

   en.wikipedia.org/wiki/Kickoff_(gridiron_football)

   A kickoff is a method of starting a drive in gridiron football. Additionally, it may refer to a kickoff time, the scheduled time of the first kickoff of a game. Typically, a kickoff consists of one team – the "kicking team" – kicking the ball to the opposing team – the "receiving team". The receiving team is then entitled to return the ...

6. Line of scrimmage - Wikipedia

   en.wikipedia.org/wiki/Line_of_scrimmage

   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 ...

7. Glossary of American football terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_American...

   An illegal block or tackle using the legs to trip an opponent. line of scrimmage. One of six vertical planes parallel to the goal line when the ball is to be put in play by scrimmage. For each team in American football, the line of scrimmage is through the point of the ball closest to their end line.

8. Chain crew - Wikipedia

   en.wikipedia.org/wiki/Chain_crew

   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 ...

9. American football rules - Wikipedia

   en.wikipedia.org/wiki/American_football_rules

   American football rules. Gameplay in American football consists of a series of downs, individual plays of short duration, outside of which the ball is or is not in play. These can be plays from scrimmage – passes, runs, punts or field goal attempts (from either a place kick or a drop kick) – or free kicks such as kickoffs and fair catch kicks.