A gyro is a rigid body that rotates at high speed around a fulcrum. Gyro is one of the earliest folk entertainment tools in China, also known as sudra. It is called "Gan Le" in Minnan dialect and "Jia" or "Beating an old cow" in the north. Wuqiao area in Hebei Province is called Bo. Guizhou and other places are called géluō not not. Puyang, Henan is called Delou, and Jiaozuo dialect is called Pi Laojian.