Concertina wire

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What Wikipedia says

Concertina wire or Dannert wire is a type of barbed wire or razor wire that is formed in large coils which can be expanded like a concertina. In conjunction with plain barbed wire (and/or razor wire/tape) and steel pickets, it is most often used to form military-style wire obstacles.

Excerpt from the Wikipedia article “Concertina wire”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Tiia Monto, CC BY-SA 3.0, via Wikimedia Commons.