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