In the British TV show Dragon's Den, the investment deal-making room is called the Den.
The name is central to the programme's imagery: entrepreneurs enter the room to face the Dragons and present their businesses. The setting is designed to make the negotiations feel high-pressure, with the entrepreneurs required to answer questions about valuation, sales, costs and the amount of equity they are offering.
The Den is not simply a generic television studio label. It is the British programme's defining title concept and explains why the investors are called Dragons. The American adaptation uses a different animal metaphor, calling its investors sharks, while other international versions use their own localised titles and terminology.