'''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 defense purposes. It serves as a layer of defense that is used 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 defense purposes. It serves as a layer of defense that is used with other means of defense. |