in this Match: Grzegorz Puzon vs Rafal Poleszak at Arena Berserkerow 2
Fighting area – CAGE
According to UFC Rules and Regulations, an MMA competition or exhibition may be held in a ring or a fenced area. The fenced area can be round or have at least six sides.
There are variations on the cage such as replacing the metal fencing with a net, or using a different shape for the area other than an octagon, as the term “The Octagon” is trademarked by the UFC (though the 8-sided shape itself is not trademarked). The fenced area is called a cage generically, or a hexagon, an octagon or an octagon cage, depending on the shape.