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  2. Cornerback - Wikipedia

    en.wikipedia.org/wiki/Cornerback

    Most modern National Football League defensive formations use four defensive backs (two safeties and two corners); Canadian Football League defenses generally use five defensive backs (one safety, two defensive halfbacks, and two corners). A cornerback's responsibilities vary depending on how the defense assigns protection to its defensive ...

  3. American football positions - Wikipedia

    en.wikipedia.org/wiki/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 [1] on the field at one time and have "unlimited free substitutions", meaning that they may change any number of players during any "dead ball" situation.

  4. Defensive back - Wikipedia

    en.wikipedia.org/wiki/Defensive_back

    In Canadian football, which has twelve players on the field compared to the eleven of American football, there is an additional position called defensive halfback, which plays like a hybrid between a linebacker and cornerback. Canadian formations include two cornerbacks, two halfbacks and one safety, for a total of five defensive backs.

  5. Uniform number (American football) - Wikipedia

    en.wikipedia.org/wiki/Uniform_number_(American...

    Otherwise all players can be numbered 0–99; the NCAA makes no stipulation on defensive players. Two players may also share the same number, although they may not play during the same down. Starting in the 2020 NCAA football season, the use of duplicate numbers was restricted to only two players on a team, and players were allowed to wear No ...

  6. Nickelback (American football) - Wikipedia

    en.wikipedia.org/wiki/Nickelback_(American_football)

    In American football, a nickelback is a cornerback or safety who serves as the additional defensive back in a nickel defense. A base defense consists of two cornerbacks and two safeties, making the nickelback the fifth defensive back on the field, thus tying the name of the position to the name of the North American 5-cent piece.

  7. Personnel grouping (gridiron football) - Wikipedia

    en.wikipedia.org/wiki/Personnel_grouping...

    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]

  8. Center (gridiron football) - Wikipedia

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

    Jason Kelce (No. 62) prepares to snap the football to Philadelphia Eagles quarterback Carson Wentz in a 2017 game. Center or centre (C) is a position in American football.The center is the innermost lineman of the offensive line on a football team's offense who passes (or "snaps") the ball between his legs to the quarterback at the start of each play.

  9. Return specialist - Wikipedia

    en.wikipedia.org/wiki/Return_Specialist

    Devin Hester, the first and only return specialist inducted into the Pro Football Hall of Fame, fielding a punt during special teams practice at the Chicago Bears' 2007 training camp. A return specialist or kick returner is a player on the special teams unit of a gridiron football team who specializes in returning punts and kickoffs.