They are subsets (Unicode block) of the Unicode repertoire of characters:
- Basic Latin (Unicode block), Latin-1 Supplement (Unicode block)
- Latin Extended-A, Latin Extended-B, Latin Extended Additional, Latin Extended-C, Latin Extended-D, Latin Extended-E
- Greek and Coptic, Greek Extended
- Cyrillic (Unicode block), Cyrillic Supplement
- Cyrillic Extended-A, Cyrillic Extended-B, Cyrillic Extended-C