Gyroscope 101: That tiny phone sensor has a big history

Gyro Ball for Hand, Grip, & Forearm - Wrist Exerciser Strengthener - Gyroscope Ball to Regulate Tension, Arthritis & Carpal Tunnel - Gyroscopic Hand Exercise Balls

Self-Starting Wrist Gyro Ball, Wrist Strengthening Device, Hand Enhancer, Forearm Exerciser, Used to Strengthen Arms, Fingers, Wrist Bones and Muscles

A gyroscope is a device used for measuring or maintaining orientation and angular velocity. It is a spinning wheel or disc in which the axis of rotation (spin axis) is free to assume any orientation by itself. When rotating, the orientation of this axis is unaffected by tilting or rotation of the mounting, according to the conservation of angular momentum. | Electronique & Electricité