O, Unicode subscripts and superscripts, Octonion, Fraktur, Ordinal indicator, Enclosed Alphanumeric Supplement, Enclosed Alphanumerics, Ö, Ò, Oʻ, Ɵ, Ǫ, Õ, Open-mid back rounded vowel, Ơ, Mid back rounded vowel, Ó, Open O, ⱺ, O', Ø, Ǫ́, Circumflex, Mid front rounded vowel, O͘, Bilabial click, Ꝍ, Inverted breve, Breve, International Phonetic Alphabet, Macron (diacritic), Dot (diacritic), Livonian language, Double acute accent, Mid central vowel, Nasal vowel, Ogonek, Double grave accent, Hook above, Finno-Ugric transcription, Cedilla

Vietnamese alphabet, Shift Out and Shift In characters, R-colored vowel, Ring (diacritic), Diethyl ether, Nasal bilabial click, Scribal abbreviation, Small caps, Caron, O,O′-Diacetyldopamine, P&O, O visa, O-methylated flavonoid, O,O′-Dipivaloyldopamine, O (disambiguation), O Antiphons, O-GlcNAc, O A e o Z, Douglas O-38, O-Acetylbufotenine, O class, O-Pivalylbufotenine, Pui O, O line, O series, O lucenti, o sereni occhi, Big O, Tai O, Ping-O-Tronic, Big O notation, O. Henry Award, O (Cyrillic), O Come, O Come, Emmanuel, O-ring, Haplogroup O-M119, O Tannenbaum, Ó Paí, Ó, O Tempo e o Vento, O-type star, P&O Cruises, O le Ao o le Malo, O-linked glycosylation, Isoflavone-7-O-beta-glucoside 6"-O-malonyltransferase, P&O Princess Cruises, Flavonol-3-O-beta-glucoside O-malonyltransferase, O-demethylpuromycin O-methyltransferase, Kamen Rider Den-O + Shin-O, Pig-hoo-o-o-o-ey, Ó Rothláin, O-Bi, O-Ba: The End of Civilization

O, Unicode subscripts and superscripts, Octonion, Fraktur, Ordinal indicator, Enclosed Alphanumeric Supplement, Enclosed Alphanumerics, Ö, Ò, Oʻ, Ɵ, Ǫ, Õ, Open-mid back rounded vowel, Ơ, Mid back rounded vowel, Ó, Open O, ⱺ, O', Ø, Ǫ́, Circumflex, Mid front rounded vowel, O͘, Bilabial click, Ꝍ, Inverted breve, Breve, International Phonetic Alphabet, Macron (diacritic), Dot (diacritic), Livonian language, Double acute accent, Mid central vowel, Nasal vowel, Ogonek, Double grave accent, Hook above, Finno-Ugric transcription, Cedilla, Vietnamese alphabet, Shift Out and Shift In characters, R-colored vowel, Ring (diacritic), Diethyl ether, Nasal bilabial click, Scribal abbreviation, Small caps, Caron, O,O′-Diacetyldopamine, P&O, O visa, O-methylated flavonoid, O,O′-Dipivaloyldopamine, O (disambiguation), O Antiphons, O-GlcNAc, O A e o Z, Douglas O-38, O-Acetylbufotenine, O class, O-Pivalylbufotenine, Pui O, O line, O series, O lucenti, o sereni occhi, Big O, Tai O, Ping-O-Tronic, Big O notation, O. Henry Award, O (Cyrillic), O Come, O Come, Emmanuel, O-ring, Haplogroup O-M119, O Tannenbaum, Ó Paí, Ó, O Tempo e o Vento, O-type star, P&O Cruises, O le Ao o le Malo, O-linked glycosylation, Isoflavone-7-O-beta-glucoside 6"-O-malonyltransferase, P&O Princess Cruises, Flavonol-3-O-beta-glucoside O-malonyltransferase, O-demethylpuromycin O-methyltransferase, Kamen Rider Den-O + Shin-O, Pig-hoo-o-o-o-ey, Ó Rothláin, O-Bi, O-Ba: The End of Civilization, Google I/O, Daddy-O, O-Acetylserine, Vitexin 2"-O-rhamnoside 7-O-methyltransferase, Ó Sé, Protein O-GlcNAcase, Ó Lochlainn, Cyanidin 3-O-rutinoside 5-O-glucosyltransferase, Lycoming O-235, Asynchronous I/O, Delphinidin 3',5'-O-glucosyltransferase, O-type main-sequence star, Cyanidin-3-O-glucoside 2-O-glucuronosyltransferase, Tam o' Shanter, Anti-streptolysin O, Haplogroup O-M175, O (German magazine), O scale, Anthocyanin 3-O-glucoside 6''-O-hydroxycinnamoyltransferase, HNLMS O 20, Memory-mapped I/O and port-mapped I/O, Cyrillic O variants, The Big O, Yeshe-Ö, Jack-o'-lantern, Handley Page Type O, THC-O-acetate, P&O Ferries, USS O-12, Shibuya O-East, Subdwarf O star, Séamus Ó Fearghail, W/o, Double-O, O... Saya, Te Pīhopatanga o Te Upoko o Te Ika, Bit-O-Honey, O tempora, o mores!, O Silêncio Q Precede O Esporro, Continental O-200, Te o Tsunagō/Ai o Utaō, Lycoming O-290, Yam O, Domnall Ó Cuindlis, O‑Level, I/O scheduling, Punk-O-Rama, Heme O, Anthocyanin 5-O-glucoside 6'''-O-malonyltransferase, 'O pere e 'o musso, O-Zone, Te Pīhopatanga o Te Manawa o Te Wheke, Douglas O-2, Beta-glucogallin O-galloyltransferase, USS O-7, Páidí Ó Sé, O, The Oprah Magazine, O-Bahn Busway, O-aew, Luteolin-7-O-diglucuronide 4'-O-glucuronosyltransferase