Font
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In metal typesetting, a font is a particular size, weight, and style of a typeface, a set of fonts that share an overall design. For instance, the typeface Bauer Bodoni includes fonts "Roman 12pt", "b
Metal type sorts arranged on a composing stick
A 1910 letterpress poster, advertising an auction, using a variety of typefaces and fonts
Emphasis (typography)
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In typography, emphasis is the strengthening of words in a text with a font in a different style from the rest of the text, to highlight them. It is the equivalent of prosody stress in speech.
Font
…set of fonts that share an overall design. For instance, the typeface Bauer Bodoni (shown in the figure) includes fonts "Roman 12pt" (or "regular"), "bold 12pt" and "italic 12pt"; each of these styles is also available in a range of other common sizes. In traditional printing, fonts were physically created…
Dominican Missal, c. 1240, with rubrics in red (Historical Museum of Lausanne)
Shakespeare's play Othello, printed in 1623. Bold type had not yet been invented. Emphasis is provided by using italics, used for key words, stage directions and the names of characters, and capitalization of key words.