The term 'Quattro-Uno' is a combination of two Italian words, meaning four and one. It is commonly used to describe a type of car, the Audi Quattro-Uno, which was first released in 1980. The Audi Quattro-Uno was the first production car to feature permanent four-wheel drive, and its success in rallying competitions helped to popularize the concept of four-wheel drive cars. The crossword solution for this term is 'TRE', which is the Italian word for three.