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用来标记犯规、出界等的地点的。
维基解释:http://en.wikipedia.org/wiki/NFL_officials
If a player not carrying the ball steps out of bounds (a wide receiver running a deep passing route or a player running downfield on punt coverage, for example), the official will drop his hat to mark the spot of where the player went out of bounds. The hat also is often used to signal a second foul called by the official on a play (by those officials that may carry only one flag); to indicate unsportsmanlike conduct committed against the official himself (as when a player shoves an official); or when some other situation requires a physical mark and the official has already used the ordinary item on the play. Some conferences discourage the use of the hat in these situations, and the bean bag will be used instead. |
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