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