" The boy tutted. ‘Let me give you a friendly tip,’ he said, ‘Now you wouldn’t want to be called female mud-spawn, would you? Well, in a similar way, when addressing a spirit such as me, the word Demon is in all honesty a little demeaning to us both. The correct term is Djin though you may add adjectives such as noble or asplendent if you choose. Just a question of manners. It keeps things friendly between us. "

― Jonathan Stroud , The Golem's Eye (Bartimaeus, #2)