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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

EM

Abbr. for “end matched.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

EM

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

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.
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References in periodicals archive ?
The editors tell us they have selected the writings that "most vividly reveal aspects of Kafka's craft as an insurance lawyer--articles and briefs with literary value that are at the same time relevant to his literary work." That em dash is a bit of a stretch.
She shudders at the overuse of em dashes. She can spot dangling participles or repetitive syntax a mile away.
a series of holes scar the paper with space / nearly flooded by you." In between stanzas, the sea is demarcated by lines either in the form of slashes or em dashes. In "to the sea near lampedusa," the lines are interrupted by commas, some directly after a word or lingering between stanzas:
Once I locked in on the difference between en dashes, hyphens, and em dashes, I found that, as with other roles in MLA, the satisfaction comes from working with gifted colleagues who generously give of their time and expertise, in this case for the excellence of its premier journal Notes.