What is "graphemes"

Usage examples of "graphemes".

Most significantly however I suspect that the syllabary of Priest-Kings remains complex, and that experiments with unscented graphemes were never conducted, because, except for lexical additions, they wish to keep their language much as it was in the ancient past.

Surely an experienced C Motivator like himself could distangle the confusion of graphemes of an isolated planet, once he put his thought upon it.