What is the mechanical arm of a robot commonly referred to as?

The mechanical arm of a robot is commonly referred to as a manipulator. This term highlights the primary function of the mechanical arm, which is to manipulate objects in the robot's environment. A manipulator is designed to perform tasks similar to a human arm, such as picking up, moving, and positioning objects with precision and control. It typically consists of various joints and links, allowing for a wide range of motion and dexterity.

The term "appendage" can refer generally to any limb or part of a body, including robotic arms, but it lacks the specific connotation of manipulating objects, which is central to the function of a manipulator. "Controller" refers to the system or software that directs the robot's operations rather than the physical arm itself. "Extension" could imply an additional part of a robot but does not capture the essential functional role of the mechanical arm in terms of movement and interaction with other objects. This distinction makes "manipulator" the most accurate term in the context of robotic arms.