Mixed martial arts (MMA) is a full-contact combat sport that allows striking and grappling, both standing and on the ground, using techniques from other combat sports and martial arts. The first documented use of the term mixed martial arts was in a review of UFC 1 by television critic Howard Rosenberg in 1993.
According to the Unified Rules of Mixed Martial Arts, 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. Cages vary: some replace the metal fencing with a net, others have a different shape from 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.