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

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