The assistant referee (or "linesman" as it is sometimes incorrectly called) wears a uniform shirt, shorts, and socks consistent with the referee. The AR also wears black shoes, sometimes with cleats or rubber grips on the sole. The AR will also have a flag, used for signalling when the ball is out of play and when an offside infraction, foul, or other misconduct has occurred. Most ARs will also wear a watch to keep a backup record of game time, red and yellow cards, a whistle, a notebook or score sheet, a pen, and a game coin (just as the Referee has all these things) so that he or she can take the Referee's place in the event of incapacitation. Finally, some professional leagues use a referee communication system, and so the AR will be equipped with this as well, if available.
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