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

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