'Quattro' was the name of the first Audi to use permanent all-wheel drive (AWD). Following the success of this model, Audi began to produce AWD versions of other models, and added the 'Quattro' designation to them, thus producing the '4000 Quattro', the 'Coupe Quattro', and so on.

To distinguish the first Quattro from these other models, Audi engineers began to call it the 'Ur-Quattro', 'Ur' being a German prefix meaning 'original'.

'Quattro' may be abbreviated - e.g. 200Q = 200 Quattro.