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