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

International Phonetic Alphabet, Diethyl ether, Shift Out and Shift In characters, Scribal abbreviation, R-colored vowel, Ring (diacritic), Nasal bilabial click, Small caps, Caron, O,O′-Diacetyldopamine, P&O, O visa, O,O′-Dipivaloyldopamine, O (disambiguation), O-methylated flavonoid, O Antiphons, O-GlcNAc, O A e o Z, Douglas O-38, O-Acetylbufotenine, O class, O line, O lucenti, o sereni occhi, Pui O, O series, O-Pivalylbufotenine, Tai O, Big O, Ping-O-Tronic, Big O notation, O. Henry Award, O Come, O Come, Emmanuel, O (Cyrillic), Haplogroup O-M119, O-ring, O Tannenbaum, Ó Paí, Ó, O Tempo e o Vento, O-type star, P&O Cruises, O le Ao o le Malo, Isoflavone-7-O-beta-glucoside 6"-O-malonyltransferase, P&O Princess Cruises, O-linked glycosylation, O-demethylpuromycin O-methyltransferase, Flavonol-3-O-beta-glucoside O-malonyltransferase, Pig-hoo-o-o-o-ey, Kamen Rider Den-O + Shin-O, Ó Rothláin, O-Bi, O-Ba: The End of Civilization

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