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

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

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