Runways change takeoff/landing direction based on the wind. Usually, there are some runways that have a letter after a number, meaning there are two parallel runways and one is Left and the other is Right (so you can find 18R/36L and 18L/36R) (see for example [this query][1]). query][1]); there are also runways that are marked by a "C", which means they are the central runway among three. The D is not standard, so it should be either 18L/36R or, if it's the only runway, 18/36.
[1]: https://overpass-turbo.eu/s/12NJ