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

Finno-Ugric transcription, Cedilla, Scribal abbreviation, Diethyl ether, R-colored vowel, Open back rounded vowel, 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-Pivalylbufotenine, O-Acetylbufotenine, Big O notation, O line, O. Henry Award, O class, O lucenti, o sereni occhi, Pui O, O series, Ping-O-Tronic, Tai O, Big O, O Come, O Come, Emmanuel, O-ring, O (Cyrillic), Haplogroup O-M119, O Tannenbaum, O Tempo e o Vento, Ó Paí, Ó, O-type star, P&O Cruises, O-linked glycosylation, Isoflavone-7-O-beta-glucoside 6"-O-malonyltransferase, 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, O-Bi, O-Ba: The End of Civilization

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