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

lphabet Ring (diacritic) Small caps Nasal bilabial 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 O lucenti, o sereni occhi Pui O O series Tai O Ping-O-Tronic Big O O. Henry Award Big O notation O Come, O Come, Emmanuel O-ring Haplogroup O-M119 Yeshe-Ö O Tannenbaum O Tempo e o Vento Ó Paí, Ó P&O Cruises O-type star O le Ao o le Malo P&O Princess Cruises