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

(disambiguation) O Antiphons 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 Come, O Come, Emmanuel O. Henry Award Tai O O Tempo e o Vento Ping-O-Tronic Big O notation Haplogroup O-M119 Yeshe-Ö O Tannenbaum Ó Paí, Ó O-ring O le Ao o le Malo