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

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

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