Pickelhaube

The Pickelhaube (plural Pickelhauben; from the old German Pickel = "point" or "pickaxe", and Haube = "bonnet", a general word for headgear), also "Pickelhelm," was a spiked helmet worn in the 19th and 20th centuries by German military, firefighters, and police. Although typically associated with the Prussian army, the helmet saw wide use among uniformed occupations in the Western world.