This is a way of marking territory if they are rubbing the sides of their faces on the object. Cats have scent glands around their lips and on their chins. The facial pheromones that they mark with are signals of a happy or calm cat to other cats.
The part that simultaneously enables the axle to flex while transmitting the driving force is called a drive axle joint, and is also known as a constant velocity (or CV) joint. The CV Boot is a ribbed, rubber flexible boot that keeps water and dirt out of the joint and the special grease inside the joint.
Vehicle title. In the United States the certificate of title for a vehicle (also known as a car title or pink slip) is a legal form, establishing a person or business as the legal owner of a vehicle. Vehicle titles in the U.S. are commonly issued by the state Department of Motor Vehicles (DMV).