What does the D represent in car models?

[Polly]

Model D refers to luxury car models. Below is an introduction to D-class models: Classification basis for car models: The further back the letter is in the alphabet, the longer the wheelbase of this class of cars will be, and the larger the displacement and weight will also be, with the luxury level of the sedan increasing accordingly. Additionally, A, B, and C-class cars represent compact cars, midsize cars, and full-size cars respectively. A0 and A00 also denote compact car classes. Representative models of D-class cars: The representatives are still the German Big Three: the Mercedes-Benz S-Class, BMW 7 Series, and Audi A8, which dominate the majority of the market share. Besides these models, there are also ultra-luxury models like the Lexus LS, Jaguar XJ, Rolls-Royce, and Bentley.