In the 1960s, teams would distinguish between flankers (e.g. the New York Jets professional football club's George Sauer) and split ends (e.g. his teammate, Don Maynard) on their player rosters. For a relatively brief period, game rules had been adopted in some codes, requiring different uniform numbers for line players from those of backs, and the position naming distinction carried on for a while after the rules were amended to require only certains sets of numbers for ineligible and eligible receivers of forward passes. It became commonplace for ends to shift into backfield positions and vice versa. By the 1970s, the common practice changed to refer to flankers and split ends both as wide receivers or, more colloquially, "wideouts"—they play from wide of the rest of the formation.