O (disambiguation) Ö Ơ Õ Ø Ó P&O O O visa O' O-methylated flavonoid Ò O Antiphons O A e o Z Douglas O-38 O-GlcNAc O class O line Pui O Open O O series O lucenti, o sereni occhi Oʻ Big O O. Henry Award Tai O O Come, O Come, Emmanuel Ping-O-Tronic O Tempo e o Vento Big O notation Haplogroup O-M119 Yeshe-Ö O Tannenbaum Ó Paí, Ó O-ring Ɵ O le Ao o le Malo Ó Rothláin