You've probably seen the numbers painted on the ends of airport runways, but they're not just a basic numbering system. They actually have a deeper meaning.

Every airport runway displays two large numbers at each end. These aren’t random identifiers but precise compass headings divided by ten. A runway numbered 27 points west at 270 degrees. The opposite ...

A plane taking off on a runway with numer on it - muratart/Shutterstock A curious mind would have certainly seen the giant numbers like "09", "28", or "22" painted on the runway and wondered what ...