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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.
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Origin of hash mark

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