"since `em quad' is hard to distinguish from `en quad', printers sometimes called it a `mutton quad'"
a linear unit (1/6 inch) used in printing
EM的用法和样例:
例句
In printing, the surface area taken up by type of a given size. Thus an8 point type occupies a print area of8 point em. 在印刷技术中,给定尺寸的铅字所占有的表面积。这样,一个8点的铅字则占有8点em的印刷面积。
Okay. Well, em, can you stop at the chicken store? 是这样啊,那你能在鸡肉店前停车吗?