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

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