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Yat with diaeresis (Ѣ̈ ѣ̈) was a letter of the Cyrillic script. It was formerly used in Russian, before 1918 when the letter was removed. The letter comes from a yat with a diaeresis.
It represented instances when yat was pronounced like ё (yo).
See also
- Ё ё: Yo, its modern successor
- Cyrillic characters in Unicode