isogone (noun)

1. In the cartoon, the isogone was depicted as a colorful line connecting different areas on the map with the same magnetic declination.

2. The main characters in the anime followed the isogone to navigate through the magnetic fields and find the hidden treasure.

3. During the Age of Discovery, explorers used isogones to chart their course and avoid dangerous magnetic anomalies.

4. The isogone was incorporated into the design of the building to represent the harmony and unity of different magnetic declinations within the structure.