The business-investor panel in the BBC programme Dragon's Den is called the dragons.
The title describes the wealthy investors who sit together while entrepreneurs present their businesses. Each dragon evaluates a pitch independently and may offer money in return for an ownership stake. Their questioning and negotiations form the central dramatic structure of the programme.
The terminology is specific to the British title. In the American adaptation Shark Tank, the investors are called sharks, while the Japanese source programme Money no Tora is associated with tigers. These related labels are easy to mix up because the programmes use similar pitching formats.
The word “dragons” is plural because the programme normally features several investors on the panel. Individual panel members are therefore described as dragons, while the group is commonly referred to collectively as the dragons. That is the established British-series term.