A gyroscope is an angular motion detection device that uses a momentum-sensitive shell of a high-speed rotating body to rotate around one or two axes orthogonal to the rotation axis relative to the inertial space. Angular motion detection devices made using other principles that perform the same function are also called gyroscopes. A gyroscope device with various functions made by utilizing the mechanical properties of a gyroscope is called a gyroscope. It is widely used in various fields such as science, technology, and military. For example: gyrocompass, orientation indicator, flipping of cannonballs, nutation of gyro, etc.
The compass, also called the compass, is a tool used for Feng Shui detection and is a commonly used operating tool in the Liqi sect. The compass is mainly composed of a magnetic needle located in the center of the disk and a series of concentric circles. Each circle represents the ancient Chinese's understanding of a certain level of information in the large system of the universe. The ancient Chinese believed that a person's aura is controlled by the aura of the universe. If a person is in harmony with the universe, it is good, and if he is not in harmony with the universe, it is bad. Therefore, based on their experience, they put all the information at all levels in the universe, such as the stars in the sky, everything on the earth represented by the five elements, the heavenly stems and the earthly branches, etc., on the compass. Feng shui masters use the rotation of magnetic needles to find the best location or time for a specific person or specific thing. Although the concept of "magnetic field" is not mentioned in Feng Shui, the coordination of the directions, orientations, and intervals between the circles on the compass implies the laws of "magnetic field".