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

ons O A e o Z Douglas O-38 O-GlcNAc O class O line Pui O O series O lucenti, o sereni occhi Big O O. Henry Award O Come, O Come, Emmanuel Tai O Ping-O-Tronic O Tempo e o Vento Big O notation Haplogroup O-M119 Yeshe-Ö O Tannenbaum O-ring Ó Paí, Ó O le Ao o le Malo