Apparently it's called threshold in english[0], which is interesting to me, since it is called the same in Slovak ("prah"). I thought prah is a homonym, since I

Apparently it's called threshold in english[0], which is interesting to me, since it is called the same in Slovak ("prah"). I thought prah is a homonym, since I don't see the connection to the mathematic threshold. Anyway, many south-east Asia temples have the same rule - don't step on the door threshold. [0] - https://en.wikipedia.org/wiki/Threshold_(architecture) https://en.wikipedia.org/wiki/Threshold_(architecture)