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

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