A small mammal, of the family Erinaceidae or subfamily Erinaceinae (spiny hedgehog, the latter characterized by their spiny back and often by the habit of rolling up into a ball when attacked.)
A type of moveable military barricade made from crossed logs or steel bars, laced with barbed wire, used to damage or impede tanks and vehicles; Czech hedgehog.
A spigot mortar-type of depth charge weapon from World War II that simultaneously fires a number of explosives into the water to create a pattern of underwater explosions intended to attack submerged submarines.
A kind of electrical transformer with open magnetic circuit, the ends of the iron wire core being turned outward and presenting a bristling appearance.