razor wire, also known as concertina wire or barbed tape.
Here's some information about it:
Purpose: It's a security barrier designed to deter and prevent unauthorized access due to its razor-sharp blades.
Material: It's typically made from a corrosion-resistant galvanized steel cutting ribbon wrapped around a core of galvanized spring steel wire.
Applications: Commonly used for enhancing security in various settings, including military bases, prisons, private properties, and commercial areas.
Installation: It can be installed on top of fences or walls to strengthen protection or spread out on the ground as a barrier.