A: Gyroscope is a device for measuring angle and maintaining direction. Its principle is based on the conservation of angular momentum. Let's take a look at the dynamic schematic diagram of the gyro. The golden rotor in the middle is our "gyro", which will not be affected by inertia, while the three "steel rings" around it will change because the equipment changes its posture, so as to detect the current state of the equipment. And the axes where these three "steel rings" are located are the "three axes" in our three-axis gyroscope, namely X axis, Y axis and Z axis. The three-dimensional space surrounded by three axes jointly detects various movements of the mobile phone, and the main function of the gyroscope is that it can measure angular velocity.