Janusz S. Bien <jsb...@mimuw.edu.pl>:
> From the Unicode glossary:
>> Grapheme. (1) A minimally distinctive unit of writing in the context of a
>> particular writing system.[...] (2) What a user thinks of as a character.
>> User-Perceived Character. What everyone thinks of as a character in their
> […] the definitions are language/locale dependent.
A writing system is (usually) language-dependent, a script is not, although
some scripts have been used exclusively (or prominently) in a single writing
system with a single language. So definition (1) of ‘grapheme’ would be
appropriate for linguistics, (2) maybe for typography and computer science, but
it’Í extremely vague.