A wrestling ring is the ring stage on which professional wrestlers wrestle.
Configuration and construction
The configuration and construction of the "traditional" ring is very similar to that of a boxing ring, though the wrestling version has three ring ropes, one fewer than the standard boxing ring. In addition, the ring ropes are not tethered together at their midpoint making them less taut than boxing ropes. Most (if not all) wrestling rings also incorporate more in the way of padding and shock absorbing construction than boxing rings, although this varies according to the preferences of the promoter.
Wrestling rings are generally composed of an elevated steel beam and wood plank stage covered by foam padding and a canvas mat, with the elevated sides then covered with a fabric skirt to prevent spectators from seeing underneath. Around the ring are three ring ropes, which depending on the promotion are either hemp ropes (which WWE  and various independent organizations use) or steel cables encased in a combination of tape and rubber hosing. These ropes are held up and tensioned by turnbuckles, which, in turn, hang on steel cylindrical poles, the ring posts. The ends of the turnbuckles facing into the ring are usually heavily padded, either individually, as in the US, or with a large pad for all three similar to a boxing ring, as in Japan. Usually around ringside, there are two sets of steel steps (one on either side of the ring) that some of the wrestlers use to enter and exit the ring. All parts of the ring are often used as part of various offensive and defensive moves.
Wrestling rings vary in shape and size, with most measuring between 14 and 20 feet on each side, measured between the turnbuckles. World Wrestling Entertainment uses a 20-foot by 20-foot ring, while in the past World Championship Wrestling and Extreme Championship Wrestling used, and Total Nonstop Action Wrestling (TNA) presently uses, an 18-foot by 18-foot ring. Typically, wrestling rings are smaller than boxing rings. Rings typically include an "apron" area of the canvas ring floor, extending between one and two feet beyond the ropes; the ring itself is generally elevated between three and four feet above the ground..
The traditional ring—such as that used by WWE—is four-sided, but other configurations exist, such as the six-sided ring used by Asistencia Asesoría y Administración. TNA also used a six-sided ring beginning in 2005, before returning to a four-sided one at the 2010 Genesis pay-per-view
The term squared circle is often used by wrestling promotions and promoters to refer to the ring. It is a term that originated in traditional Greco-Roman wrestling, since the action takes place on a mat with a circle painted on it. This format is still used by amateur wrestling leagues throughout the world. It is possible that professional wrestling promoters adopted the term from these earlier roots, or it could simply be that it is referred to as a "ring," (circle) but is square in shape.