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

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