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hash mark

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noun
  1. Informal.
    1. a service stripe.
    2. the symbol #.
  2. Football. the marking formed by either inbounds line intersecting with one of the lines delineating yardage between the goal lines.

Origin of hash mark

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018