Czech Hedgehog Barrier

An iconic defensive barrier also known as Czech hedgehog. I really like its overall look and design, one metal beam with plate which when 3 are used and rotated to attach it to its self it forms a three dimensional plus sign / gizmo which is a very simple design, fast manufacturing and also defensive benefit of it being able to flip whichever way and still being as efficient. Primarily used against vehicles but can also be used against foot soldiers especially with barbwire combined. Which is also one of the iconic type of obstacle/barrier. Still widely used around the world with its modernized version razor blade wire.