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

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

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