Unit Definition (em) The em is a printer's unit of relative distance. One em is the height of the type size (in points) being used. If 12 point type is being set, then one em is 12 points, and so on.
Unit Definition (military pace) The length of a single step in marching (taken to be 30 inches for quick time or 36 inches for double time).
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Length/Distance 
Convert from em to military pace
