Icing (ice hockey) - Wikipedia
https://en.wikipedia.org/wiki/Icing_(ice_hockey)Currently, most leagues (IIHF, National Hockey League, American Hockey League, Kontinental Hockey League, NCAA college hockey, European professional leagues, and several minor North American leagues ECHL, Central Hockey League and SPHL) use hybrid icing. Most amateur leagues worldwide (such as USA Hockey ) use no-touch or automatic icing. The National Hockey League (NHL) introduced the icing rulein September 1937 to eliminate a co…