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ellipsis
A punctuation character consisting of three dots, or periods, in a row. It indicates that a word or phrase has been omitted. To access the ellipsis character in standard typefaces, press Option + semicolon.

elliptical halftone dots
Elongated halftone dots used to improve the tonal mid-range. Resolution into elliptical dots can be done photographically by means of a special screen.

embossing
Producing a raised image in paper by means of a die striking from the back of the paper into a recessed counter die at the front.

em, em space, em quad
A common unit of measurement in typography. The em is traditionally the width of the uppercase M in whatever font is being used. It defines the font's point size. For example, in 12-point type, one em is a distance of 12 points.

em dash
A dash the length of an em is used to indicate a break in a sentence.

en, en space, en quad
A common unit of measurement in typography. Traditionally, the en is the width of the uppercase N in the typeface and point size being used. Technically, it is defined as half the width of an em.

en dash
A dash the length of an en is used to indicate a range of values.

endpapers
The heavy paper at the front and back of a book, to which coverboard is glued.