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