1. a line on a map connecting points of equal magnetic declination
Usage: geography; cartography
2. a polygon with all angles equal
Usage: geometry; mathematics

Examples

• Navigators use isogons to account for the difference between true north and magnetic north.
• The isogons on this nautical chart show how magnetic declination varies across the ocean.
• A square is an isogon because all four of its interior angles are equal.
• In geometry, an isogon is a useful concept for classifying regular and semi-regular polygons.
• The map displayed several isogons running roughly north to south across the continent.