em
Definition
Unit of relative distance in typography, one em being equivalent to the point size of the type. In 8 point type, an em is 8 point wide; in 9 point type, 9 point wide; in 10 point type, 10 point wide ... and so on. So named because traditionally it is defined as the width of a capital (uppercase) letter 'M' in the face and point of type being used. See also en.
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