Final answer:
A body belt or body harness system rigged to allow an employee to be supported on an elevated vertical surface, such as a wall, and work with both hands free while leaning is known as a positioning system.
Step-by-step explanation:
A body belt or body harness system rigged to allow an employee to be supported on an elevated vertical surface, such as a wall, and work with both hands free while leaning is known as a positioning system. This type of system provides support and stability to the worker, allowing them to perform their tasks safely and comfortably. Unlike a fall arrest system, which is designed to prevent falls, and a restraint system, which limits the worker's movement, a positioning system allows for greater flexibility and freedom of movement.