College hockey most often refers to the American hockey competitive governance structure establishe by the National Collegiate Athletic Association, or NCAA, though leagues out side of the United States exist. In the NCAA there are 3 national divisions, I, II and III, each having many conferences, and supporting both men's and women's teams. Only divisions I and III have championships, the championship for Division II was suspended following 1999, due to a lack of sponsoring schools. Most of the schools in Division II hockey became members of newly formed hockey conferences such as College Hockey America, which plays in Division I. The Frozen Four is the trademarked name of the final two rounds of the NCAA Division I championship of ice hockey in the USA. Schools advance in a single-elimination tournament from four regional sites to a single site, where the national semifinals and final game are played. The NCAA started a Women's Frozen Four beginning in the 2000-01 season.