O (Mongolic)

O
O
	<img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f9/Mongolian_letter_O_%28isolated_form%29.svg/140px-Mongolian_letter_O_%28isolated_form%29.svg.png" decoding="async" width="140" height="140" class="mw-file-element" data-file-width="420" data-file-height="420">
The Mongolian script
Mongolian vowels
Mongolian consonants
Foreign consonants
	Mongolian script multigraphs;
	v; t; e;

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

Mongolian language

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.