'''Concertina wire''' is a type of [[barbed wire]] or razor wire which is formed in large coils. It is typically used by military forces for defensive purposes. It serves as a layer of [[defense]] that is used in conjunction with other means of defense. | '''Concertina wire''' is a type of [[barbed wire]] or razor wire which is formed in large coils. It is typically used by military forces for defensive purposes. It serves as a layer of [[defense]] that is used in conjunction with other means of defense. |