terrella
/təˈrɛlə/
noun
- A small model or representation of the Earth, especially a spherical magnet used to demonstrate the Earth's magnetic field.
- Students observed the terrella as iron filings aligned along its magnetic lines.
- The physics teacher used a terrella to show how the Earth's magnetic field works.
- In the laboratory, the terrella floated in a magnetic field to simulate the planet's poles.