The room where entrepreneurs present their proposals in Dragon's Den is called the Den.
The Den is the programme's central pitch setting. Entrepreneurs enter, introduce themselves and their business, and make a presentation to the panel of investors. The Dragons then question them about areas such as turnover, margins, valuation, intellectual property and distribution.
The name is part of the British programme's identity and explains its title. The investors are called Dragons because the setting presents them as formidable business figures who scrutinise each proposition before deciding whether to invest.
The term can be confused with the title used by other versions of the format. In the American adaptation, Shark Tank, entrepreneurs pitch in the Tank and the investors are called Sharks. Those names belong to the US version rather than the BBC programme.