triple crown

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The three-tiered tiara formerly worn by Popes.
• noun sports An award representing victory in three events, especially in horse-racing.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (baseball) an unofficial title won by a batter who leads the league in hitting average, runs batted in, and home runs
• noun (horse racing) a title won by a horse that can win the Kentucky Derby and the Belmont Stakes and the Preakness