O

O
O
O o
Usage
Writing system	Latin script
Type	Alphabetic
Language of origin	Latin language
Sound values	[o]; [o̞]; [ɔ]; /oʊ/; [uː]; [ʌ]; [ɒ]; [ø]; [a]; [ʕ]; [w]; [◌ʷ]; [ʊ]; [ə]; [ɐ];
In Unicode	U+004F, U+006F
Alphabetical position	15
History
Development	Ο ο 𐌏 O o; ; ; ; ; ;
Time period	~−700 to present
Descendants	Ö; ⱺ; Ø; Œ; Ɔ; Ơ; Ỏ; Ꝋ; ∅; º; ℅;
Sisters	ᴥ; Ƹ; ʿ; О; Ю; Ө; ע; ع; ܥ; ࠏ; ዐ; ࡘ; ჺ; Ո ո; Օ օ; ᱳ; ᱜ ᱣ;
Other
Associated graphs	o(x)
Writing direction	Left-to-right
	This article contains phonetic transcriptions in the International Phonetic Alphabet (IPA). For an introductory guide on IPA symbols, see Help:IPA. For the distinction between [ ], / / and ⟨ ⟩, see IPA § Brackets and transcription delimiters.

O, or o, is the fifteenth letter and the fourth vowel letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is o (pronounced /ˈoʊ/), plural oes.^[1]

^ "O" Oxford English Dictionary, 2nd edition (1989);Chambers-Happap, "oes" op. cit. Oes is the plural of the name of the letter. The plural of the letter itself is rendered Os, O's, os, o's.