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

Finno-Ugric transcription, International Phonetic Alphabet, Livonian language, R-colored vowel, Scribal abbreviation, Ring (diacritic), Small caps, Nasal bilabial click, Caron, O,O′-Diacetyldopamine, P&O, O visa, O,O′-Dipivaloyldopamine, O (disambiguation), O-methylated flavonoid, O Antiphons, O A e o Z, O-GlcNAc, Douglas O-38, O-Methylnordehydrobufotenine, O class, O-Acetylbufotenine, O-Pivalylbufotenine, O series, Pui O, O lucenti, o sereni occhi, O line, Big O, Big O notation, O. Henry Award, Ping-O-Tronic, Tai O, Haplogroup O-M119, O (Cyrillic), O Come, O Come, Emmanuel, O Tannenbaum, Ó Paí, Ó, O-ring, O Tempo e o Vento, P&O Princess Cruises, O-type star, O-linked glycosylation, P&O Cruises, Flavonol-3-O-beta-glucoside O-malonyltransferase, Isoflavone-7-O-beta-glucoside 6"-O-malonyltransferase, Kamen Rider Den-O + Shin-O, Pig-hoo-o-o-o-ey, O-demethylpuromycin O-methyltransferase, Ó Rothláin, Cyanidin 3-O-rutinoside 5-O-glucosyltransferase

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