https://en.wikipedia.org/wiki/Fence
"Barbed Wire, SC, Victoria, 15.9.2007" by Jjron - Own work. Licensed under CC BY-SA 3.0 via Commons -https://commons.wikimedia.org/wiki/File:Barbed_Wire,_SC,_Victoria,_15.9.2007.jpg#/media/File:Barbed_Wire,_SC,_Victoria,_15.9.2007.jpg
Chain-link fencing
Barbed tape
"Razor Wire Bunch" by Smithers7 - Own work. Licensed under CC BY 3.0 via Commons - https://commons.wikimedia.org/wiki/File:Razor_Wire_Bunch.JPG#/media/File:Razor_Wire_Bunch.JPG
Agricultural fencing
Electric fence
Detail of an electric fence material made of synthetic cord with metal interwoven through it, attached to a steel fence post with a plastic insulator. This material is more visible than wire, but most often used for temporary fencing.
Wire obstacle
A complex obstacle belt of low wire entanglement backed by a double apron fence. Both obstacles have movable openings that can be blocked with knife rests.