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

opamine P&O O,O′-Dipivaloyldopamine O (disambiguation) O-methylated flavonoid O visa O Antiphons O A e o Z O-GlcNAc Douglas O-38 O class Pui O O-Acetylbufotenine O line O series O lucenti, o sereni occhi Big O O. Henry Award Big O notation Ping-O-Tronic O Come, O Come, Emmanuel Tai O O-Pivalylbufotenine O-ring Haplogroup O-M119 O Tannenbaum Yeshe-Ö Ó Paí, Ó O Tempo e o Vento P&O Princess Cruises P&O Cruises Ó Rothláin O le Ao o le Malo O (Cyrillic) O-type star Flavanone 7-

O-glucoside 2"-O-beta-L-rhamnosyltransferase Ō Rissei Ó Flaithbheartaigh 8-hydroxyfuranocoumarin 8-O-methyltransferase Lycoming O-320 Doyle O-2 Oriole Laugh-O-Gram Studio O with tilde (Cyrillic) Five Pointe O Triple-O USS O-6 Cho-Den-O series O-Desmethylangolensin O schöner Mai! O Ta-ryŏn N-acetylneuraminate 7-O(or 9-O)-acetyltransferase O gaúcho Lycoming O-435 Lycoming O-360 HNLMS O 24 Big O Tires Yi O O with macron (Cyrillic) Cruise-O-Matic USS O-5 Maelbrighte Ó Hussey