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

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