It’s a list of specific disallowed pairs, such as “Cyrillic with Greek” or “Tibetan with anything that isn’t Tibetan”. Ogham isn’t on the list, although Runic is.
It’s a list of specific disallowed pairs, such as “Cyrillic with Greek” or “Tibetan with anything that isn’t Tibetan”. Ogham isn’t on the list, although Runic is.