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

Circumflex, Scribal abbreviation, Finno-Ugric transcription, Open back rounded vowel, R-colored vowel, Ring (diacritic), International Phonetic Alphabet, Small caps, 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-Pivalylbufotenine, O class, O line, Pui O, Big O notation, O lucenti, o sereni occhi, O series, O. Henry Award, Big O, Ping-O-Tronic, Tai O, O Come, O Come, Emmanuel, O-ring, O (Cyrillic), Haplogroup O-M119, O Tannenbaum, Ó Paí, Ó, O Tempo e o Vento, O-type star, P&O Cruises, O-linked glycosylation, Isoflavone-7-O-beta-glucoside 6"-O-malonyltransferase, P&O Princess Cruises, Flavonol-3-O-beta-glucoside O-malonyltransferase, O-demethylpuromycin O-methyltransferase, Kamen Rider Den-O + Shin-O, Pig-hoo-o-o-o-ey, Ó Rothláin

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