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

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