Crenulations Margins of structures with shallow notches and projections. Website https://www.google.co.il/search?q=crenulations&biw=1536&bih=824&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjQ557TmsfLAhVJPRoKHYb1DHkQsAQILg