btw, in the german sign language, wich is used in germany and belgium, pickelhaube is the sign for police and germany

here the sign for different european countrys
https://www.youtube.com/watch?v=eXX5IjoEyL8
there are hundreds of sign languages around the world but pickelhaube may only exist in the german sign language https://en.wikipedia.org/wiki/List_of_sign_languages