Every car company uses its own internal vehicle designation. Sometimes it may be the same as the model name or it may be something different. I work at an automotive company and we supply to many different manufacturers. The large line of GM trucks (ie. Suburban, Yukon) goes by the designation GMT 800, while the Toyota Tundra goes by 700N. Some have some meaning while others have no meaning at all.
<img src='http://www.geocities.com/royb9t8/MY_BMW_2.jpg' border='0' alt='user posted image' />
<span style='color:blue'>My ass may be dumb, but I ain't no dumb ass!</span>