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

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