Em (Noun)
Meaning 1
A linear unit (1/6 inch) used in printing.
Classification
Nouns denoting quantities and units of measure.
Synonyms
Hypernyms
Meaning 2
A quad with a square body; "since `em quad' is hard to distinguish from `en quad', printers sometimes called it a `mutton quad'".
Classification
Nouns denoting quantities and units of measure.