[Hamuko]

If we want to get really technical, “DS4” is a model from Citroën and they later spun out the DS lineup into its separate brand, with the “Citroën DS4” becoming “DS 4”, “DS” being the make and “4” being the model.

[pavlov]

And even more pedantically, DS has recently adopted a new naming scheme where the former DS 4 is now written as DS N°4, pronounced "number 4"...

Their stated inspiration for this SEO bomb is Chanel perfumes.