The Japanese business programme on which the British show Dragons' Den is based is Money Tigers.
Money Tigers was a Japanese television format in which entrepreneurs presented business proposals to potential investors. The central dramatic idea—founders asking wealthy backers for money in exchange for an ownership stake—was later adapted for broadcasters in many countries.
The British version retains the basic pitch structure but uses its own investors, presenters, editing style, and business stories. International editions are often known by related titles, including Shark Tank in the United States, even though the panel and production details differ.
A common mix-up is to identify Dragons' Den as an entirely original British creation because the BBC version became especially prominent. The concept itself, however, came from Japan. “Money Tigers” is the specific source-format name, not a nickname for the British investors or a description of the show’s logo.