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

Diethyl ether, Cedilla, Finno-Ugric transcription, Scribal abbreviation, Shift Out and Shift In characters, Ring (diacritic), Nasal bilabial click, Small caps, 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-Methylnordehydrobufotenine, O-Pivalylbufotenine, O class, O line, Pui O, O series, Big O notation, O lucenti, o sereni occhi, O. Henry Award, O Come, O Come, Emmanuel, Big O, Ping-O-Tronic, Tai O, Haplogroup O-M119, O (Cyrillic), O-ring, O Tannenbaum, Ó Paí, Ó, O Tempo e o Vento, O-type star, 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, Kamen Rider Den-O + Shin-O, Pig-hoo-o-o-o-ey, Asynchronous I/O, O-Acetylserine

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