Proper noun
(ice hockey, US, informal) The four regional champions of the NCAA Division I tournament, one of whom will become the national champion.
(ice hockey, US, informal) The final two rounds of the NCAA Division I tournament.
(ice hockey, US, informal) An appearance in the Frozen Four.
These two teams have an amazing number of Frozen Fours between them.
He also showed me a Facebook post that his friend, Matt, wrote after the Frozen Four loss to Boston University in 2015. Source: Internet