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

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

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