A glyph is an element of writing. Example: the ligature 'æ' in archæology represents a and e letters.
More exactly, a glyph is an element in an agreed set of symbols. A mark used in a language is a glyph, but in another language it may not be a glyph. For example, an 'n' with tilde, ñ, is used in Spanish, as in piñata. It is not a glyph in English.
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|The Simple English Wiktionary has a definition for: glyph.|