Hatch marks

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Hatch marks, sometimes also called hash marks, or tick marks, are a form of mathematical notation. They are typically used three ways:

  • Unit and value marks – as on a ruler or number line.
  • Congruency notation – as on a geometric figure.
  • Graphed points – as on a graph.

Hatch marks are frequently used as an alternate form of abbreviation for some common units of measurement.

In regard to distance, a single hatch mark typically indicates feet and a double hash mark indicates inches within the English system. In regard to time, a single hatch mark indicates minutes and a double hatch mark indicates seconds; these typically occur following hours, indicated by an elevated circle. The same system is used within Geometry and Trigonometry for the measurement of angles in degrees, minutes and seconds.

Also see


  1. Wikipedia see Hatch marks [1]

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