The investor panel on the British Dragon's Den is called the Dragons.
The title comes from the programme's central premise: entrepreneurs enter a room and face wealthy business investors who can offer money for an ownership stake. Each investor is individually referred to as a Dragon, and the group is collectively known as the Dragons.
The wording distinguishes the British programme from international adaptations. The American version is called Shark Tank and uses Sharks, while the Japanese source format Money Tigers used Tigers. Those labels are related to the same broad television idea but are not the official name of the UK panel.
The Dragons are not judges awarding a competition prize. They evaluate commercial proposals, question entrepreneurs about figures and strategy, and may negotiate terms. An entrepreneur can receive no offer, one offer, or competing offers from multiple Dragons.