O is a letter of related and vertically oriented alphabets used to write Mongolic and Tungusic languages.^{[1]: 549–551}

Mongolian language

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O
The Mongolian script
Mongolian vowels
ᠠ​ a ᠡ​ e ᠢ​ i ᠣ​ o ᠤ​ u ᠥ​ ö ᠦ​ ü ᠧ​ (ē)
Mongolian consonants
ᠨ​ n ᠩ​ ng ᠪ​ b ᠫ​ (p) ᠬ​ q/k ᠭ​ γ/g ᠮ​ m ᠯ​ l ᠰ​ s ᠱ​ š ᠲ​ t ᠳ​ d ᠴ​ č ᠵ​ ǰ ᠶ​ y ᠷ​ r ᠸ​ (w)
Foreign consonants
Mongolian script multigraphs
v t e

• Transcribes Chakhar /ɔ/;^[7][8] Khalkha /ɔ/, /ə/, and /∅/.^{[9]: 40–42} Transliterated into Cyrillic with the letter о.^[10][4]
• Indistinguishable from u, except when inferred by its placement: it is only found in medial or final syllables if the initial syllable also carries it, or rarely when it carries the vowel i.^{[2]: 11, 19 [11]: 9–10}
• ‍ᠣ᠋ = the final form used in loanwords, as in ᠷᠠᠳᠢᠣ᠋ radio (радио radio).^{[10]: 48 [12]: 36 [13]}
• ‍ᠣ᠋‍ = medial form used after the junction in a proper name compound.^[12]: 44
• Derived from Old Uyghur waw (𐽳), preceded by an aleph (𐽰) for isolate and initial forms.^{[3]: 539–540, 545–546 [14]: 111, 113 [12]: 35}
• Produced with W using the Windows Mongolian keyboard layout.^[15]
• In the Mongolian Unicode block, o comes after i and before u.

Clear Script

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Xibe language

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Manchu language

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