em

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em

[em]
(graphic arts)
A unit of linear measurement used in printing which is equal to the point size of the type; for example, an em in 6-point type is 6 points wide.

EM

Abbr. for “end matched.”

EM

em

(1) (EM) (ElectroMagnetic) See electromagnetic radiation.

(2) In typography, a unit of measure equal to the width of the capital letter "M" in a particular font. Ems are widely used in website typography as a basic unit of measure. Rather than using pixels, which is a fixed width on any screen, the default font size is set to ems, and all fonts on the page that are larger or smaller are designated as multiples or fractions of ems.

Em Dash, En Dash
The terms "em" and "en" are the dashes commonly found in typography, but which are not standard keyboard keys. An "em dash" (one em wide) is used to convey changes such as an abrupt break in thought, a digression or a change from one speaker to another. "En dashes" (width of letter N) are shorter and are used for ranges such as numbers and dates. Contrast with the hyphen, which is a regular text character used to separate telephone and account numbers.


Em and En Dashes in HTML
The mdash and ndash are the codes used to create em and en dashes on HTML pages, whereas the hyphen is a regular text character in HTML.
References in classic literature ?
Most o' aw, rating 'em as so much Power, and reg'latin 'em as if they was figures in a soom, or machines: wi'out loves and likens, wi'out memories and inclinations, wi'out souls to weary and souls to hope - when aw goes quiet, draggin on wi' 'em as if they'd nowt o' th' kind, and when aw goes onquiet, reproachin 'em for their want o' sitch humanly feelins in their dealins wi' yo - this will never do 't, sir, till God's work is onmade.
They brought 'em from Spain and N' York and places.
Great things bigger than fifty 'ouses, bigger than the Crystal Palace--bigger, bigger than anything, flying about up in the air and whacking at each other and dead men fallin' off 'em.
They'll all go soon, for th' missis niver lets 'em stay past ten.
She's a bit cross wi' the dogs when they offer to come in th' house, but if they depended on her, she'd take care and have 'em well fed.
There's folks, i' my opinion, they can't see ghos'es, not if they stood as plain as a pike-staff before 'em.
If ghos'es want me to believe in 'em, let 'em leave off skulking i' the dark and i' lone places--let 'em come where there's company and candles.
I don't believe it was a shock; it stands to reason she'd never 'a' got up after it and been so smart as she is now; we had three o' the worst shocks in our family that there ever was on this river, and I know every symptom of 'em better'n the doctors.
Some time he'll forget one of 'em and give to the other, or drop 'em both and give to some new girl
They run wild, but they was in rich soil, so some of 'em lived.
all the old folks called 'em painters an' catamounts an' varmints.
They an't pop'lar, and they an't common; but I stuck to 'em, sir; I've stuck to 'em, and realized well on 'em; yes, sir, they have paid their passage, I may say," and the trader laughed at his joke.