How to use em quad in a sentence
There are 18 units in a quad, which, unlike the em quad of foundry type, in the smaller sizes is not usually an exact square.
An old-time rule required an em quad after a period before beginning another sentence in the line.
It is desirable to end a paragraph with an em quad, if this is practicable, rather than fill the last line flush.
The usual indention of paragraphs in plain reading matter is an em quad at the beginning of the first line.