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

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