The Cyrillic script
Slavic letters
А А̂ А̄ Ӑ Ӓ Б В Г Ґ Д Ђ Ѓ Е Е̂ Е̄ Ё Є Ж З З́ Ѕ И І Ї Ꙇ И̂ Ӣ Й Ӥ Ј К Л Љ М Н Њ О О̂ О̄ Ӧ П Р С С́ Т Ћ Ќ У У̂ Ӯ Ў Ӱ Ф Х Ц Ч Џ Ш Щ Ꙏ Ъ Ы Ь Э Ю Я ʼ ˮ
Non-Slavic letters
А̊ А̃ Ӓ̄ Ӕ Ә Ә̃ Ӛ В̌ Ԝ Г̑ Г̇ Г̣ Г̌ Г̂ Г̆ Г̈ Г̊ Ҕ Ғ Ӻ Ғ̌ Ғ̊ Ӷ Г̡ Д́ Д̌ Д̈ Д̣ Д̆ Ӗ Е̃ Ё̄ Є̈ Ԑ Ԑ̈ Җ Ӝ Ӂ Ж̣ Ҙ Ӟ З̌ З̣ З̆ Ӡ И̃ И̇ Ҋ Қ Ӄ Ҡ Ҟ Ҝ К̣ К̊ Қ̊ Ԛ ᴫ Л́ Ӆ Ԯ Ԓ Л̈ Ӎ ᵸ Н́ Ӊ Ң Ԩ Ӈ Ҥ О̆ О̃ Ӧ̄ Ө Ө̄ Ө́ Ө̆ Ӫ Ԥ П̈ Р̌ Ҏ С̌ Ҫ С̣ С̱ Т́ Т̈ Т̌ Т̇ Т̣ Ҭ Ᲊ У̃ У̌ Ӳ У̊ Ӱ̄ Ұ Ү Ү́ Х̣ Х̱ Х̮ Х̑ Х̌ Ҳ Ӽ Х̊ Ӿ Ӿ̊ Һ Һ̈ Ԧ Ц̌ Ц̈ Ҵ Ҷ Ҷ̣ Ӵ Ӌ Ҹ Ч̇ Ч̣ Ҽ Ҿ Ш̣ ꚜ Ы̆ Ы̄ Ӹ ꚝ Ҍ Ҩ Э̆ Э̄ Э̇ Ӭ Ӭ́ Ӭ̄ Ю̆ Ю̈ Ю̄ Я̆ Я̄ Я̈ Ӏ
Archaic or unused letters
А̨ Б̀ Б̣ Б̱ В̀ Г̀ Г̧ Г̄ Г̓ Г̆ Ҕ̀ Ҕ̆ Ԁ Д̓ Д̀ Д̨ Ԃ Ꚁ Ꙣ Е̇ Е̨ Ж̀ Ж̑ Ꙃ Ꙅ Џ̆ Ꚅ Ꚅ̆ Ꙁ З̀ З̑ Ԅ Ԇ Ꚉ Ԫ Ꚃ Ꚕ І̂ І̣ І̨ Ј̵ Ј̃ Ꙉ К̓ К̀ К̆ Ӄ̆ К̑ К̇ К̈ К̄ Ԟ К̂ Л̀ Ԡ Ꙥ Ԉ Л̑ Л̇ Ԕ М̀ М̃ Ꙧ Н̀ Н̄ Н̧ Н̃ Ԋ Ԣ Н̡ Ѻ Ꙩ Ꙫ Ꙭ ꙮ Ꚙ Ꚛ П̓ П̀ П́ Ҧ П̧ П̑ Ҁ Ԛ̆ Р́ Р̀ Р̃ Ԗ С̀ С̈ Ԍ Ҫ̓ Т̓ Т̀ Ԏ Т̑ Ꚋ Т̧ Ꚍ Ꚍ̆ Ѹ Ꙋ У̇ У̨ ꙋ́ Ф̑ Ф̓ Х́ Х̀ Х̆ Х̇ Х̧ Х̾ Х̓ һ̱ Ѡ Ꙍ Ѽ Ѿ Ꙡ Ц̀ Ц́ Ц̓ Ꚏ Ꚏ̆ Ꚑ Ч́ Ч̀ Ч̆ Ч̑ Ч̓ Ԭ Ꚓ Ꚇ Ꚇ̆ Ҽ̆ Ш̀ Ш̆ Ш̑ Щ̆ Ꚗ Ꚗ̆ Ъ̄ Ъ̈ Ъ̈̄ Ꙑ Ы̂ Ы̃ Ѣ Ѣ́ Ѣ̈ Ѣ̆ Ꙓ Э̨ Э̂ Ꙕ Ю̂ Ꙗ Я̈ Я̂ Я̨ Ԙ Ѥ Ѧ Ꙙ Ѫ Ꙛ Ѩ Ꙝ Ѭ Ѯ Ѱ Ѳ Ѵ Ѷ Ꙟ
List of Cyrillic letters List of Cyrillic multigraphs

O with circumflex (О̂ о̂; О̂ о̂) is a character in the Cyrillic alphabet. The letter was created and in the most common version of the Udege language's alphabet, the Khabarovsk version, used for the northern dialects.^[1] This letter has also been used historically in the Ukrainian language, and in some 19th-century publications in the Karelian language.^[2]

• M. O. Maksymovych proposed new letters for usage in the Ukrainian alphabet, based on the etymological principles of spelling to preserve the old writing of Ukrainian. His orthography is known as Maksymovychivka [uk]. Of the letters proposed, О̂ was one of them.^[3]
• It is formally used in the Rusyn language.^[4]
• It was also used in Polish Cyrillic in the 1860s.
• It is also used in some dialects of some South Slavic languages such as Bulgarian and Serbian.^[5]
• It was also used in a 1820 publication in Tver Karelian.^[2]
• In the northern dialects of Udege, the letter represents a glottalized [o].^{[6][better source needed]}

• O o : Latin letter O
• Ô ô : Latin letter Ô - a letter in Slovak and Vietnamese
• О о : Cyrillic letter О