Sumo, the national sport of Japan, is a combat sport where two wrestlers face off in a circular ring called "dohyo." Apart from "sumo ring," there are several other synonyms for it, such as "dohyoiri," "dohyoban," and "dohyo." The term "dohyoiri" refers to the ring's ceremonial process, which involves several rituals, including the throwing of salt and stomping of feet. "Dohyoban" is another term used to describe the sumo ring, and it refers to the square platform on which the circular ring rests. Finally, the term "dohyo" comes from the Japanese word "doujou," which means "training gym," and refers to the wrestling arena where sumo tournaments are held.