Isobar

Real World Example

Imagine you're at a party and trying to find all the people who are listening to the same song on their headphones. Just as you move from person to person, connecting those sharing the same tune, an isobar on a weather map connects points that share the same air pressure. The connection between the party-goers and weather map is that both involve identifying and linking elements that are harmonized: people with the same song and weather points with the same pressure.