Mathematical Olympiad Program

The Mathematical Olympiad Program (MOP), formerly called the Mathematical Olympiad Summer Program (MOSP), is an intensive summer program sponsored by the Mathematical Association of America. The main purpose of MOP, held since 1974, is to select and train the six members of the U.S. team for the International Mathematical Olympiad (IMO).

Source: Wikipedia — Mathematical Olympiad Program (CC BY-SA 4.0)