Penalty flag
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The penalty flag, often called a penalty marker, is a yellow cloth used in several field sports including American football, Canadian football, and lacrosse by game officials to identify and sometimes
Officials point at a penalty flag lying on the field.
Official (gridiron football)
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In gridiron football, an official is a person who has responsibility in enforcing the rules and maintaining the order of the game. During professional and most college football games, seven officials
Field judge Brad Freeman (88) and line judge Jeff Seeman (45) at an NFL game in October 2014.
An official (right) watches Navy's Shun White (#26) score a touchdown against Tulsa. Visible on his belt are his yellow penalty flag and an orange bean bag.
A pair of officials at a Maryland high school football game in September 2008. White knickers used to be worn by officials; black trousers are now standard.
A referee (foreground) follows the action of a play between the Texas Longhorns and the Rice Owls. The "R" placket on the back of his shirt identifies him as a referee, as does his white cap.