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