Until 1994, Mercedes-Benz used an alphanumeric system for categorising their vehicles, consisting of a number sequence approximately equal to the engine's displacement in liters multiplied by 100, followed by an arrangement of alphabetical suffixes indicating body style and engine type.

"C" indicates a coupe or cabriolet body style (for example, the CL and CLK models, although the C-Class is an exception, as it is also offered as a sedan).
"D" indicates the vehicle is equipped with a diesel engine.
"E" (for "Einspritzung") indicates the vehicle's engine is equipped with petrol fuel injection. In most cases (the 600 limousine and Mercedes E-Class being the exceptions), if neither "E" or "D" is present, the vehicle has a petrol engine with a carburettor.
"G" was originally used for the Geländewagen off-road vehicle, but is now applied to Mercedes SUVs in general (for example, the GLA and GLK).
"K" was used in the 1930s, indicating a supercharger ("Kompressor") equipped engine. One exception is the SSK, where K indicates "Kurz" (short-wheelbase).
"L" indicates "Leicht" (lightweight) for sporting models, and "Lang" (long-wheelbase) for sedan models.
"R" indicates "Rennen" (racing), used for racing cars (for example, the 300SLR).
"S" Sonderklasse "Special class" for flagship models, including the S-Class, and the SL-Class, SLR McLaren and SLS sportscars.
"T" indicates "Touring" and an estate (or station wagon) body style.
Some models in the 1950s also had lower-case letters (b, c, and d) to indicate specific trim levels. For other models, the numeric part of the designation does not match the engine displacement. This was done to show the model's position in the model range independent of displacement or in the price matrix. For these vehicles, the actual displacement in liters is suffixed to the model designation. An exception was the 190-class with the numeric designation of "190" as to denote its entry level in the model along with the displacement label on the right side of the boot (190E 2.3 for 2.3-litre 4-cylinder petrol motor, 190D 2.5 for 2.5-litre 5-cylinder diesel motor, and so forth). Some older models (such as the SS and SSK) did not have a number as part of the designation at all.

For the 1994 model year, Mercedes-Benz revised the naming system. Models were divided into "classes" denoted by an arrangement of up to three letters (see "Current model range" above), followed by a three-digit (or two-digit for AMG models, with the number approximately equal to the displacement in litres multiplied by 10) number related to the engine displacement as before. Variants of the same model such as an estate version or a vehicle with a diesel engine are no longer given a separate letter. The SLR, SLS and GT supercars do not carry a numerical designation.

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