dojo

The ring, made of compacted clay, in which a sumo wrestling match is held.

A training facility, usually led by one or more sensei; a hall or room used for such training.

(by extension) A room or other facility used for other activities, such as meditation or software development.

The dojo loach, Japanese weather loach, or pond loach (Misgurnus anguillicaudatus), a freshwater fish native to East Asia.