Hash-mark definitions

A service stripe on the sleeve of an enlisted person's uniform.
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A mark in either of two series placed on the field perpendicular to the yard lines and used for spotting the ball.
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Any of the segments of the inbounds line marked on the field at the yard lines: they mark the point at which the ball is put back in play after it has been grounded outside an inbounds line.
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Origin of hash-mark

Alteration of hatch