O with diaeresis (æ ç; italics: <span style="font-family: times, Times New Roman, serif; font-size: larger">æ ç</span>) is a letter of the Cyrillic script. In all its forms it looks exactly like the Latin letter à(àö <span style="font-family: times, Times New Roman, serif; font-size: larger">àö</span>).
O with diaeresis is used in the alphabets of the Altai, Khanty, Khakas, Komi, Kurdish, Mari, Shor and Udmurt languages.
In Altai, Khakas, Khanty and Shor, it represents the close-mid front rounded vowel .
In Komi, it represents the schwa , like the in "allow".
In Kurdish, it represents the near-close near-back rounded vowel , like the in "book".
In Mari, it represents the open-mid front rounded vowel , similar to .
In Udmurt, it represents the open-mid back unrounded vowel , like the in "up".
In Russian books until the beginning of the 20th century, the letter æ has been sporadically used instead of àin foreign names and loanwords (for example, the city of Cologne, Germany, which is Köln in German, might have been rendered in Russian as "ÃÂçûÃÂý").
In Tatar, this letter appeared in the 1861 Cyrillic orthography by Nikolay Ilminsky. This letter was replaced by è in 1939.
O with diaeresis and macron (æàçÃÂ; italics: æàçÃÂ) is a letter from the Cyrillic script. It is used in the southern dialects of the Selkup language, to indicate a long æ.