Imperial audience chamber.

Frank Herbert uses the term "Selamlik" to describe the metal "tent" that the Emperor's uses as his base while dealing with the Arrakis affair.

"The selamlik (Turkish: selamlık) was the portion of a Ottoman palace or house reserved for men; as contrasted with the seraglio, which is reserved for women and forbidden to men. Selamlik was also a portion of the household reserved for the guests (from the root word selam, "greeting"), similar to the andronites (courtyard of men) in Ancient Greece, where guests would be welcomed by the males of the household. The harem is the portion for the family."