Pickelhaube

The Pickelhaube (plural Pickelhauben; from the German Pickel, "point" or "pickaxe", and Haube, "bonnet", a general word for "headgear"), also Pickelhelm, was a spiked helmet worn in the nineteenth and twentieth centuries by German military, firefighters, and police. Although typically associated with the Prussian army, the helmet was widely imitated by other armies during this period.