I never saw that. What was it?
it is called a levitron
https://en.wikipedia.org/wiki/Levitron#:~:text=The%20first%20spin-stabilized%20permanent%20magnet%20levitation%20device%20was,patented%20%281983%29%20by%20inventor%20Roy%20Harrigan%2C%20of%20Vermont.