Em (typography)
Unit of measurement in the field of typography / From Wikipedia, the free encyclopedia
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"1Em" redirects here. Not to be confused with IEM (disambiguation) or lem (disambiguation).
An em (from em quadrat) is a unit in the field of typography, equal to the currently specified point size. For example, one em in a 16-point typeface is 16 points. Therefore, this unit is the same for all typefaces at a given point size.[1]
The em space is one em wide.
Typographic measurements using this unit are frequently expressed in decimal notation (e.g., 0.7 em) or as fractions of 100 or 1000 (e.g., 70⁄100 em or 700⁄1000 em). The number of pixels per em varies depending on system.