You must have seen huge numbers painted on the runway every time your flight is landing but do you know what do they signify? Let us break it down for you simply; they show the orientation of the runway from the magnetic North. The numbers that are always in the range of 1 to 36 are basically the angles from the north, rounded up to two digits. So for example, if your flight is landing on a runway that displays 12 or 36 then the runway is aligned at 120 degrees from the north or 360 degrees, respectively.
You would not really use this information practically anywhere unless you plan to go in aviation but hey, it is cool to know anyway!
h/t: Life Hacker