the Silver Arrow is the nickname given to Mercedes Benz racing
cars of the 50s. The reason for this is that back in the 50s every
country had its own racing colours, such as green for the brits,
red for italy, blue for france, white for japan and silver for
germany. So all mercedes cars raced in silver paint.
Ever since then, the nickname has stuck, and mercedes cars are
informally known as silver arrows.