Razor wire

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Barbed tape or razor wire is a mesh of metal strips with sharp edges whose purpose is to prevent trespassing by humans or to secure facilities such as prisons where there is a risk of escape. The term "razor wire", through long usage, has generally been used to describe barbed tape products. Razor wire is much sharper than the standard barbed wire; it is named after its appearance but is not razor sharp. The points are very sharp and made to rip and snag clothing and flesh.

The multiple blades of a razor-wire fence are designed to inflict serious cuts on anyone attempting to climb through or over it, which simultaneously gives it a strong psychological deterrent effect. Although it can be circumvented relatively quickly by humans with tools (Bolt cutters being a prominent example). Attempting to get through razor wire without tools is incredibly hazardous and requires a substantial amount of time; thwarting such attempts or giving corresponding security forces more time to respond.