Original: The Original Six is a term for the group of six teams that composed the National Hockey League (NHL) for the 25 seasons between the 1942–43 season and the 1967 NHL Expansion.
Simplified: The Original Six is a well-known term for the group of six teams that composed the National Hockey League (NHL) for the 25 seasons between the 1942-43 NHL season and the 1967 NHL Expansion.