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

n O,O′-Diacetyldopamine P&O O,O′-Dipivaloyldopamine O (disambiguation) O-methylated flavonoid O visa O Antiphons O-GlcNAc O A e o Z Douglas O-38 O class O-Acetylbufotenine O line Pui O O series Big O O lucenti, o sereni occhi O (Cyrillic) Tai O Ping-O-Tronic Big O notation O. Henry Award O-Pivalylbufotenine O Come, O Come, Emmanuel O-ring Haplogroup O-M119 Yeshe-Ö O Tannenbaum Ó Paí, Ó O Tempo e o Vento Ó Rothláin P&O Cruises P&O Princess Cruises O-type

star O le Ao o le Malo O-linked glycosylation Flavanone 7-O-glucoside 2"-O-beta-L-rhamnosyltransferase O. O. McIntyre 8-hydroxyfuranocoumarin 8-O-methyltransferase O with tilde (Cyrillic) Five Pointe O O schöner Mai! N-acetylneuraminate 7-O(or 9-O)-acetyltransferase Cho-Den-O series Triple-O Lycoming O-320 O Ta-ryŏn Yi O Laugh-O-Gram Studio Lycoming O-360 Cruise-O-Matic Big O Tires Lycoming O-435 USS O-6 HNLMS O 24 Tomás Ó Fiaich O-Desmethylangolensin O with macron (Cyrillic) USS O-5 O gaúcho Bit-O-Honey