Like really, why tho?
In: 0
They indicate the heading of the runway rounded to the nearest 10 with the 0 truncated.
Ie if you have an east-west runway, the west end, you have to approach by heading east, so your heading will be 90°, so the number will be 9. On the other side, you need to be heading west to approach, heading 270°, so the number will be 27. The numbers will always be 18 apart, because the runways are straight, so the two approaches headings will be 180° apart.
It makes it easy for pilots to identify the runway they need to land on, and what direction they need to be heading with nothing more than a compass in case of instrument failure. They also make these numbers using magnetic North as 0°. As a result, some Canadian airports need to change the number every once in a while as magnetic north drifts
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