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