Definitions for "Em dash"
A line the width of a font's uppercase m.
A dash that is one em wide. An em dash usually indicates missing material or a break in thought.
in composition, a unit of measurement exactly as wide and high as the point size being set. Also called a long dash.
Keywords:  comma, strong
a strong comma
a powerful tool for accurately representing the English language as it is actually spoken
Keywords:  equal, size, measurement, point, type
a measurement equal to the point size of the type being used