American football, referred to as football in the United States and Canada and also known as gridiron, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end.
In several forms of football a forward pass is a throwing of the ball in the direction that the offensive team is trying to move, towards the defensive team's goal line.
In American and Canadian football, a line of scrimmage is an imaginary transverse line (across the width of the football field) beyond which a team cannot cross until the next play has begun.
In gridiron football, a lineman is a player who specializes in play at the line of scrimmage.
A snap (colloquially called a "hike", "snapback", or "pass from center") is the backwards passing of the ball in American and Canadian football at the start of play from scrimmage.
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