O with diaeresis (Cyrillic)
O with diaeresis (Ӧ ӧ; italics: "Ӧ ӧ") is a letter of the Cyrillic script. In all its forms it looks exactly like the Latin letter Ö (Ö ö "Ö ö"). O with diaeresis is used in the alphabets of the Altay, Khakas, Komi, Kurdish, Mari, Shor and Udmurt languages. Usage. In Altai, Khakas and Shor, it represents the close-mid front rounded vowel . In Komi, it represents the schwa . In Kurdish, it represents the close back rounded vowel . In Mari, it represents the open-mid front rounded vowel . In Udmurt, it represents the open-mid  back unrounded vowel . In Russian books until the beginning of the 20th century, the letter Ӧ has been sporadically used instead of Ё in foreign names and loanwords (for example, the city of Cologne, Germany, which is "Köln" in German, might have been rendered in Russian as "Кӧльн"). In Tatar, this letter appeared in the 1861 Cyrillic orthography by Nikolay Ilminsky. This letter was replaced by Ө in 1939.