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

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

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