Ключевые слова: barbed wire, border control, borderline, boundaries, boundary fence, boundary marking, confinement, containment, crime prevention, danger, defense, deterrent, enclosure, fence, fortification, image, industrial, intrusion, isolation, metal, perimeter, prison fence, prison security, privacy, protection, resistance, restriction, safety, security, security measures, sharp, symbol, threat, trespassing, visual deterrent,