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

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

ises O (Cyrillic) O le Ao o le Malo P&O Princess Cruises O-type star