Elganator711 What a name for a car like why Sigma II
Sigma is a chassis code, GM started using Greek letters after they ran out of A-Z names, examples include the Alpha platform (ATS, CTS, Camero), Gamma (Sonic, Spark, Trax, Encore), Delta, (Ion, Cobalt, G5, Astra), Epsilon (Malibu, Aura, G6) and Lambda (Outlook, Enclave, Acadia, Traverse)