SL == Sport Leicht - Sport Light
The number generally refers to the volume of the engine, e.g.
SL 350 => 3.7 L engine SL 500 => 5.0 L engine
That's true for many Mercedes (SLK - Sport Leicht Kurtz) Mercedes C - Coupé.
You also have Mercedes A and B with the underlying meaning "it's a small Mercedes", etc.
Generally speaking car names make sense within the brand.
SL == Sport Leicht - Sport Light
The number generally refers to the volume of the engine, e.g.
SL 350 => 3.7 L engine SL 500 => 5.0 L engine
That's true for many Mercedes (SLK - Sport Leicht Kurtz) Mercedes C - Coupé.
You also have Mercedes A and B with the underlying meaning "it's a small Mercedes", etc.
Generally speaking car names make sense within the brand.