The Super Sport, or SS, is the signature performance option package offered by Chevrolet on a limited number of its vehicles.
All SS models come with distinctive “SS” markings on their exterior. The package was first made available for the 1961 Impala.
Some of the other models bearing the SS badge include the Camaro, (like our ’69 Fireball), Chevelle, El Camino, Monte Carlo, and Nova.
Current SS models are produced by the GM Performance Division.
Source – Wikipedia