<p>MOP = Math Olympiad Summer Program, for the top scorers on the USAMO.</p>
<p>At one point it was called the Math Olympiad Program. Then some dufus tried to add an S, which is uncool because MOSP doesn’t mean anything and MOSPers sounds even dumber. Everyone – even the professors and administrators at MOP, except sometimes Dunbar – calls it by its proper name, MOP. Why don’t they just officially change it back? Who knows.</p>
<p>edit: Too late, oh well.</p>