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An "em-quad" is a metal spacer used in printing presses. It is referred to by this name because it is composed of a square one em on each side. In these old-fashioned printing presses, this allowed the insertion of an em space ( ) character between other typographical characters. It is also occasionally referred to as a "mutton quad".
The width of the em space ( ) is defined to be 1 em, as is the width of the em dash (—). By contrast, the narrower unit en is half an em.
Read more about this topic: Em (typography)
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