Gyroscope

A device consisting of a wheel or disc mounted so that it can spin rapidly about an axis which is itself free to alter in direction. The orientation of the axis is not affected by tilting of the mounting, so gyroscopes can be used to provide stability or maintain a reference direction in navigation systems, automatic pilots, and stabilizers.

Sources

"Gyroscope | Definition Of Gyroscope In English By Lexico Dictionaries". 2019. Lexico Dictionaries | English. Accessed August 15. https://www.lexico.com/en/definition/gyroscope.