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Hash marks are short lines, running perpendicular to sidelines or sideboards, used to mark locations, primarily in sports.
In ice hockey, the hash marks are two pairs of parallel lines on either side of the face-off circles in both ends of the rink. Players must remain on their team's side of the hash mark nearest their own goal during a face-off until the puck hits the ice.
In American football and Canadian football, the hash marks are two rows of lines near the middle of the field that are parallel to the side lines. These small lines (about 1 yard long) are used to mark each of the 5-yard lines, which go from sideline to sideline. All plays start with the ball on or between the hash marks. That is, if the ball is downed in between a hash mark and the nearest sideline, it must be reset on the hash mark for the next play. Prior to the adoption of hash marks (which were first utilized at the first NFL playoff game in 1932), all plays began where the ball was declared dead, including extra point attempts.
In most forms of professional football, including the National Football League and most forms of indoor football, the hash marks are in line with the goal posts, both being 18 feet 6 inches apart. High school football, college football and Canadian football have hash marks significantly wider than the goal posts. The college football standard, which was the standard in the NFL before the 1972-1973 season, is 40 feet apart. The high school standard is one-third of the width of the field (53 feet, 4 inches), and the Canadian standard is 51 feet.
The field shall be 110 yards long by 65 yards wide [...] Twenty-four yards in from each Sideline each 5-yard stripe shall be marked by a short cross stripe parallel to the Sidelines (Hash Marks).
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