A "radar gun," also known as a speed gun, is a common device used by law enforcement agencies to track the speed of moving objects. However, there are other terms and phrases used to describe this device. One common term is "speed laser," which refers to the use of laser technology in determining the speed of moving vehicles. Another similar device is the "lidar gun," which uses light detection and ranging technology. Additionally, some jurisdictions use the term "Speed Detection Device" or "SDD" as a more generic term to refer to any device used to determine the speed of a vehicle.