1955 Chevrolet Bel Air . Imagine a car so popular that a new term came to be, based on that design. That name is Tri Five, which refers to 1955, 1956, and 1957 Chevrolet automobiles, in particular the Bel Air, 150, 210 Sedans, and the Nomad. With beautiful proportions and new skins each of those successive years, and a thorough peppering of chrome, these cars produced in this time became iconic.