X

Originally this letter indicated "experimental" vehicles, but later came to indicate an "exotic" or unusual vehicle. This letter is used, generally, in combination "X-car" or "Xcar", which is an unlimited class racing, cartoon prototype.

A medium sized family car of Citroën, launced on September 1997 at the Frankfurt Motor Show. According to Pierre Bessis, which was responsible for the new Citroën model names, Xsara (pronounced`zara') represents a feminine person such as a queen of Babylon.

An engine in which the cylinders occur in four rows set at an angle from each other with the crankshaft running through the intersection of the X. The single crankshaft is turned by all banks of cylinders. This is a particularly case of the radial engine.