Unicode uses the term grapheme cluster to emphasize the fact that it can be composed of a cluster of codepoints, and perhaps also to distinguish it from the lin

Unicode uses the term grapheme cluster to emphasize the fact that it can be composed of a cluster of codepoints, and perhaps also to distinguish it from the linguistic term grapheme. But ultimately in the context of Unicode I think you could just get away with using grapheme. That's what Perl did when it invented Normalization Form Grapheme (NFG).