hashmark

/ˈhæʃmɑrk/
noun
  1. A small line or mark, often used to indicate a unit of measurement or a tally.
    • The recipe called for a hashmark next to the ingredient to show the amount.
    • She drew a hashmark on the wall to count each day of the project.
    • The soldier wore a hashmark on his sleeve for every four years of service.
  2. A short horizontal line used in writing or printing, such as in a hashtag or on a ruler.
    • He added a hashmark before the word 'fun' to make it a hashtag.
    • On the ruler, each hashmark represents one millimeter.
    • The carpenter used a pencil to make a hashmark where the cut should go.
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