Also known as Yo with macron
letra cirílica
In the Vinony graph
Vinony's link graph records 280 inbound references to Ё̄, and connects out to Я, Cyrillic script and yus.
It is catalogued under topics including Cyrillic letters with diacritics, Letters with diaeresis and Letters with macron.
Vinony links it to 10 Wikipedia language editions.