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Cyrillic letter On
Cyrillic numerals: 70
Unicode (hex)
majuscule: U+041E
minuscule: U+043E
Cyrillic alphabet
А	Б	В	Г	Ґ	Д	Ђ
Ѓ	Е	Ѐ	Ё	Є	Ж	З
Ѕ	И	Ѝ	І	Ї	Й	Ј
К	Л	Љ	М	Н	Њ	О
П	Р	С	Т	Ћ	Ќ	У
Ў	Ф	Х	Ц	Ч	Џ	Ш
Щ	Ъ	Ы	Ь	Э	Ю	Я
Non-Slavic letters
Ӑ	Ӓ	Ә	Ӛ	Ӕ	Ғ	Ҕ
Ӻ	Ӷ	Ԁ	Ԃ	Ӗ	Ӂ	Җ
Ӝ	Ԅ	Ҙ	Ӟ	Ԑ	Ӡ	Ԇ
Ӣ	Ҋ	Ӥ	Қ	Ӄ	Ҡ	Ҟ
Ҝ	Ԟ	Ԛ	Ӆ	Ԓ	Ԡ	Ԉ
Ԕ	Ӎ	Ӊ	Ң	Ӈ	Ҥ	Ԣ
Ԋ	Ӧ	Ө	Ӫ	Ҩ	Ҧ	Ҏ
Ԗ	Ҫ	Ԍ	Ҭ	Ԏ	Ӯ	Ӱ
Ӳ	Ү	Ұ	Ҳ	Ӽ	Ӿ	Һ
Ҵ	Ҷ	Ӵ	Ӌ	Ҹ	Ҽ	Ҿ
Ӹ	Ҍ	Ӭ	Ԙ	Ԝ	Ӏ
Archaic letters
Ҁ	Ѻ	ОУ	Ѡ	Ѿ	Ѣ	Ꙓ
Ꙗ	Ѥ	Ѧ	Ѫ	Ѩ	Ѭ	Ѯ
Ѱ	Ѳ	Ѵ	Ѷ	Ꙟ
List of Cyrillic letters
Cyrillic digraphs

O (О, о) is a letter of the Cyrillic alphabet, representing the vowel /o/ word-initially and after hard consonants. Because of vowel reduction processes, the Russian /o/ phoneme may have a number of pronunciations in unstressed syllables, including [ɐ] and [ə].

The letter's traditional name is on, meaning "he", or "that" (masculine noun) in Old Church Slavonic. It is derived from the Greek letter omicron (<Ο, ο>).

It looks exactly like the Latin letter <O>.

Broad On

Broad On (Ѻ ѻ) is a variation of the Cyrillic letter On (О, о) used in Church Slavonic:

• as the first letter of a word's root:
  • in the initial position (ѻгнь, ѻтрокъ),
  • after a prefix (праѻтецъ),
  • in compound words (ѻбоюдуѻстрый),
• in two geographical names (iѻрданъ—Jordan River, iѻппіа—city of Jaffa) and their derivatives,
• as the numerical sign to represent the number 70.

A misleading Unicode name of Broad On is Round Omega. (Notice that the Cyrillic Omega represents 800 instead of 70).

Different writing between
On and Broad On

See also

• Vowel reduction in Russian
• Ё
• O, o - Latin
• Ο, ο - Оmicron (Greek)