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

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