A rocker arm is an engine component that is responsible for opening and closing the valve. It is a crucial part of an internal combustion engine that ensures smooth operation. There are several synonyms for rocker arm, including valve lifter, cam follower, and pushrod. These terms are often used interchangeably in the automotive industry. The rocker arm assembly consists of several parts, including the rocker arm itself, the adjusting screw, and the locking nut. These parts work together to transfer motion from the camshaft to the valve. Understanding the different names used to describe rocker arms is important for anyone working with engines or car parts.