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