[stovt001]

Yeah, now that Cadillac's names don't mean anything, they need to have a cohesive, organized system of naming rules in place. BMW has a fairly logical system:

Sedans, coupes, convertibles, and wagons have a 3 digit number. The first digit indicates model and increases according to size (1 series is the smallest, 7 series the largest) and the second two numbers indicate trim (now that's where it gets sketchy, since the two digit trim number has no apparent correlation to displacement, power, or anything else like that). Letters on the end indicate special options, like X indicating AWD.
Roadsters are indicated by a "Z" followed by the model number.
CUVs are indicated by an "X" followed by the model number

Mercedes is more complicated, having many more model lines. Unlike BMW, that has a 3 series coupe, convertible, and sedan (and soon a GT hatch-ish thing), Mercedes has different model designations for each. It helps if you know some German. K stands for Kurtz, which is German for "short". So an SLK is a smaller version of an SL, sort of. Like BMW, letter designations for models are followed by numbers for trim.

Audi may have the best with numbers once again indicating models ascending according to size, like BMW, only this time preceded by letters indicating body style or vehicle type: A for sedan, coupe, or hatch, S for performance versions of the A models, RS for extra high performance versions of the A models, Q for CUVs, R for sports cars. Simple.

Lexus is simply a letter followed by "S" for sedans and "X" for crossovers, and a number indicating trim. Like Cadillac, no real order. The model hierarchy does not follow the alphabetical order of letters. Then again, the IS convertibles and coupes break this trend, as does the SC.

Infiniti is very simple, straight-forward, and logical. G is entry level, M is upper level for sedans/coupes/convertibles, EX is entry level, FX is upper level for CUVs, and the number following indicates engine size in tenths of a liter of displacement. Brilliant!

Cadillac and Lexus should make their naming schemes more logical. It would allow consumers to more easily grasp the product hierarchy. I'd like to see Cadillac go back to actual names, but sadly most of theirs have been tainted by poor past products. Too bad, as a real name would allow the cars to be distinguished from the competition's alpha-numeric jumble and would in a way evoke the Rolls Royce and Bentley tradition of giving cars beautiful names.