The investors in the British television programme Dragons' Den are commonly called Dragons.
The name comes directly from the programme's title and reflects the investors' role as powerful business figures scrutinising entrepreneurs and their proposals. Each Dragon may offer money in exchange for a share of a company, although a pitch can also end without any investment.
The term is specific to this international franchise family. In the United States version, Shark Tank, the investors are called Sharks, while the Australian programme Shark Tank Australia uses the same wording. Those names should not be substituted for the British programme's established term. Dragons' Den has featured different panels over the years, but the collective name has remained unchanged.