Barbed wire

Barbed wire was a type of wire fencing with sharp edges.

Barbed wire was used during World War I. The Second Doctor, Jamie McCrimmon and Zoe Heriot came across some barbed wire while exploring a War Lord replica of the Western Front, with Jamie calling them "wee spikes". He accidentally pricked his fingers on it and the Doctor called it "filthy stuff". (TV: The War Games)