In March 2006, Lamborghini unveiled a new version of its halo car at the Geneva Motor Show: the Murciélago LP 640. The new title incorporated the car's name, along with an alphanumeric designation which indicated the engine's orientation (Longitudinale Posteriore), along with the newly updated power output.
At the 2009 Geneva Motor Show, Lamborghini unveiled the ultimate version of the Murciélago, the LP 670–4 SuperVeloce. The SV had previously appeared on the Diablo SV, and Miura. SV variants are more extreme and track-oriented, and are released at the end of each model's production run. (courtesy of Wikipedia)