I read somewhere, I think Autoweek, where a Rep from Cadillac said it stood for C-Series Touring Sedan. I didnt really like the idea because it seemed they were taking BMW Series with MB Letters and combining the 2...STS S-Series and so on...as far as the cimmarron i love it. My mom had one when I was in high school(same car white and blue) and I drove it all the time. And although to this day nobody believes me that car was pretty quick