奥数 Traditional form: 奧數 Pinyin (reading): Aò Shù Definitions: International Mathematical Olympiad (IMO) (abbr. for 國際奧林匹克數學競賽/国际奥林匹克数学竞赛 ( Guójì Aòlínpǐkè Shùxué Jìngsài)) Characters: 奥 - mysterious, obscure, profound; used in transliterations 数 - count, number, several Traditional characters: 奧 - mysterious, obscure, profound; used in transliterations 數 - count, number, several