Canadian football terminology

thumb|A player from Texas High School crosses the goal line with the ball during a game against Highland Park High School to score a rushing touchdown worth six points. thumb|Vince Young of the Texas Longhorns (ball carrier in top center) rushing for a touchdown. A portion of the [[end zone is seen as the dark strip at the bottom. The vertical yellow bar is part of the goal post.]]

offensive position in American and Canadian football

thumb|right|A defensive back from Poudre High School intercepts a pass in a 2011 game against Rocky Mountain High School ([[Fort Collins, Colorado).]]

thumb|In white jerseys, Lance Briggs (#55) and [[Brian Urlacher (#54) of the Chicago Bears, are positioned as linebackers on Lambeau Field in 2011]] A Linebacker (LB) is a playing position in gridiron football. Linebackers are members of the defensive team, and typically line up three to five yards behind the line of scrimmage and so back up the defensive linemen. They play closer to the line of scrimmage than the defensive backs (secondary).

In gridiron football, tackling the quarterback for a loss before they are able to throw a forward pass

scoring area on the field in gridiron football

means of scoring in American football and Canadian football

imaginary transverse line in American football, beyond which a team cannot cross until the next play has begun

football scoring play

thumb|Houston Texans|Houston Texan running back [[Arian Foster fumbles the ball against the Dallas Cowboys during a 2010 NFL regular season game.]] thumb|The rate of fumbles by running backs in the NFL has decreased steadily since the AFL–NFL merger.

play in American and Canadian football

method of starting a drive in gridiron football

scoring play in gridiron football

Measure of the performance of passers in gridiron football

In American football, a touchback is a ruling that is made, and signaled by an official, when the ball becomes dead on or behind a team's own goal line (i.e., in their end zone) and the opposing team gave the ball the momentum, or impetus, to travel over the goal line, but did not have possession of the ball when it became dead. Such impetus may be imparted by a kick, pass, fumble, or in certain instances by batting the ball. Thus, a touchback is not a play, but a result of events that may occur during a play.

Gridiron football play

a single play in American or Canadian football

line in American football and Canadian football

formation

right|thumb|300px|The slotback (SB) in the flexbone formation.

seldom-used position in gridiron football

in American football, the area between the 20 yard line and the goal of the defensive team

football foul