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

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