# 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

**Wikidata**: [Q1738399](https://www.wikidata.org/wiki/Q1738399)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Rattleback)  
**Source**: https://4ort.xyz/entity/rattleback