Also known as Oe with macron, Barred O with macron
Cyrillic letter
In the Vinony graph
Vinony's link graph records 278 inbound references to Ө̄, and connects out to Я, Cyrillic script and yus.
Vinony files it under Cyrillic letters with diacritics and Letters with macron.
Vinony links it to 8 Wikipedia language editions.