Further, consider how we say "digraph" for sequences of two letters forming a single whole, e.g. "th" in English, "gn" in French. And "trigraphs", e.g. German "sch". Now what would you call all the rest, those composed of only ONE letter? Monographs?
FWIW, though the word "unigraph" does have a specialised use in graph theory... http://wwwteo.informatik.uni-rostock.de/isgci/classes/gc_256.html ...its main practical use actually seems to be for naming companies. :-/
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