For Greek, Cyrillic, and Latin in specific, Unicode has to be round-trip compatible with encoding schemes which distinguish between them. (There might have bee

For Greek, Cyrillic, and Latin in specific, Unicode has to be round-trip compatible with encoding schemes which distinguish between them. (There might have been other reasons as well, but the round-trip desideratum forces it in any case.) There are a lot of characters which were explicitly encoded for such compatibility: https://en.wikipedia.org/wiki/Unicode_compatibility_characters https://en.wikipedia.org/wiki/Unicode_compatibility_characte... This document discusses equivalence among Unicode characters: http://unicode.org/reports/tr15/tr15-18.html http://unicode.org/reports/tr15/tr15-18.html