Meaning of the toenail:=In human anatomy, a nail is a horn-like envelop covering the dorsal aspect of the terminal phalanges of fingers and toes. Nails are also present in several other primates....
you are probably refering to a rocker arm. In a pushrod motor the rocker are opens the valves. A rod rides on the camshaft and as the lobes on it come around the rod pushes up on the rocker are which...
a rocker is a guy that plays music Rocker arms. A shallow U shaped piece that goes between the push rods and the valves in the engine In newer cars, one end of the rocker arm rides on the camshaft...