What is the name of the mechanical arm major that controls the lens on the spot during filming?

Generally speaking, we have three kinds. The smallest is that the arm span is about 3 meters, the arm head only has a camera, and the machine is controlled by hand. It's called Little Rocker, also called Dolly! The bigger one, more than 5 meters, can climb. The photographer sits on the arm head, and there is a ball bowl on the arm head, so you can put the camera in! The arm is controlled by the assistant and the camera is controlled by the photographer. The longest I have ever used is 9 meters. We usually call it an elevator! There is another one, which is electrically controlled. The arm head has electronic control translation/tilt, which can control the horizontal and pitching movements of the machine. The aperture, zoom and focus of the camera can also be controlled by the electronic control part. The arm head is only on the machine, not on the person! We are used to calling guns! Generally, the minimum is 5 meters, and the longest is 15 meters. I have seen 22 meters!