rattleback (Q1738399)

semi-ellipsoidal top which will rotate on its axis in a preferred direction, but which, if spun in the opposite direction, becomes unstable, ‘rattles’ to a stop and reverses its spin to the preferred direction

anagyre
celt
Celtic stone
rebellious celt
rattlerock
spin bar
Robinson Reverser
wobble stone
wobblestone
ARK
Bizzaro Swirl
Space Pet
Space Toy

Language	Label	Description	Also known as
English	rattleback	semi-ellipsoidal top which will rotate on its axis in a preferred direction, but which, if spun in the opposite direction, becomes unstable, ‘rattles’ to a stop and reverses its spin to the preferred direction	anagyre celt Celtic stone rebellious celt rattlerock spin bar Robinson Reverser wobble stone wobblestone ARK Bizzaro Swirl Space Pet Space Toy