Barbed wire

Barbed wire, also known as barb wire, occasionally corrupted as bobbed wire or bob wire, is a type of steel fencing wire constructed with sharp edges or points arranged at intervals along the strands. It is used to construct inexpensive fences and is used atop walls surrounding secured property. Wikipedia

Did you know: Joseph Glidden's design for barbed wire wasn't the first, but it was the best. ted.com