最初从好友费振鹏的鹏博奥数网那发现此图，觉得很好，Google到了International Mathematical Olympiad那，Here!The IMO logo is available in several graphic formats.
顺便再次推荐振鹏的鹏博奥数网，那有很多IMO相关的资料。
IMO logo
qiutopia {learn and let learn}
qiutopia {learn and let learn}
http://www.omaths.com/Article/UploadFiles/200811/2008112806541286.gif