allographic

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al·lo·graph

A0214400 (ăl′ə-grăf′)n.1. A variant shape of a letter.2. A letter or combination of letters that can represent one phoneme, as f and gh can represent the phoneme /f/.3. Writing, especially a signature, made by one person for another.
al′lo·graph′ic adj.
Thesaurus
Adj.1.allographic - of or relating to an allograph