em quad

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em′ quad`

Print. a square unit of area or type, that is approximately one em on each side.
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Noun1.em quad - a quad with a square body; "since `em quad' is hard to distinguish from `en quad', printers sometimes called it a `mutton quad'"
area unit, square measure - a system of units used to measure areas
References in periodicals archive ?
Twentieth-century manuals on letterpress printing generally characterize the widths of spaces and quads used in hand composition as being fractions or multiples of the square em quad.
24) Furthermore, the set value, although loosely referred to as an em of set, does not necessarily correspond exactly to the width of a square em quad.