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In general terms a glyph is a symbol that has a meaning -- an arrow, a letter, et cetera. In digital typography the term refers to a single, specific instantiation of a character that appears in a font; the outlines for a particular punctuation, letters or figures (numbers). For example, a given OpenType font might have three different glyphs for a lowercase "a" character: a default double-story form, an alternate single-story form, and a small cap version. In that font, lowercase "a" is one character but three glyphs.