I am looking for the term describing when your hair grows kind of in a circular direction (defined by the direction of your hair root).
Many people have something like this on the back of their heads or even on their foreheads.
I found the term hair crown on dict.cc but I feel like this is either not the correct term for it or it is not very widely used. There is a German article on human hair including a section about these things but I could not find the English equivalent.
In German, these are called Haarwirbel meaning something like hair whirl.