I am hearing word that the NCAA is strongly considering changing their games to add this in the near future. This is what i found to explain what it is.
https://www.sun-sentinel.com/sports/fl-sp-elam-ending-the-basketball-tournament-20180723-story.html
https://www.sun-sentinel.com/sports/fl-sp-elam-ending-the-basketball-tournament-20180723-story.html