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1. A service stripe on the sleeve of an enlisted person's uniform.
2. Football A mark in either of two series placed on the field perpendicular to the yard lines and used for spotting the ball.
3. The symbol (#), especially when used as the start of a hashtag.
[Alteration of hatch.]
1. Informal. a service stripe.
2. (on a football field) the marking formed by either inbounds line intersecting with one of the lines delineating yardage between the goal lines.