An anti-tank steel hedgehog is a defensive obstacle used to impede and deter enemy vehicles from advancing through a particular area. These obstacles can take many different forms and have been used in warfare for centuries. Synonyms for anti-tank steel hedgehogs include dragon's teeth, Czech hedgehogs, and Tobruk blocks. Dragon's teeth are concrete pyramids used as anti-tank obstacles, while Czech hedgehogs are metal spikes arranged in a zig-zag pattern to slow down oncoming tanks. Tobruk blocks are large concrete cubes used to block roads and form a barrier against armored vehicles. Regardless of their specific design, these obstacles are designed to slow or stop tanks in their tracks and provide critical defense for troops on the ground.