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Production First Software Encyclopedia of Typography and Electronic Communication : E (4295 words) |
 | em dash By definition, a dash the width of an em. |
| em square Originally, this term referred to a 2-dimensional rectangle whose width and height corresponded to the character width and bounding box height of a letter M in a typeface. |
| Over a period of time, this definition has mutated to the point where it can refer to a square whose width and height are both equal to the character width of the M, or to a square whose width is a measure of a standard full-width character, or the widest standard width of a character. |
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