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In typography, a single unit of language like a letter or punctuation mark is called a character. This term refers to the abstract symbol itself—the idea of “A,” “!” or “?”. The visual form you see is a glyph, which is just one particular rendering of that character in a given font; the same character can have different glyphs in different fonts. A font is a specific collection of glyphs with a coordinated style and size, while a typeface is the family that groups related fonts. So the best term for that unit is character.