Originally Posted by akiburis
Unicode fully supports ancient Greek, of course. What Mobi supports is a different matter.
But the typical user is highly unlikely to have a font with the appropriate characters in it. What I meant was that the only way to guarantee that the text will be readable by the end user is to embed the font in the document and (AFAIK) Mobi doesn't support font embedding, unlike PDF (and also the Sony Reader too).