Mortals who have boarded within Sigil for a year or more often refer to one another as “cagers”, as in “residents of the birdcage”, to distinguish themselves from the “outers”, the travelers who stop over only briefly for one purpose or another.
The distinction between cager and outer is considered vital within the taverns and coffee houses and street bazaars of the birdcage because of the diverse ways there are to come to grievous bodily harm on short notice. Within the rhythm of a normal conversation, an errand trip, or a ramble through the city’s pleasure districts, cagers might communicate to one another with knowing looks or a sudden change of intonation an urgent message: to disengage and be elsewhere promptly. Often within those signals is an implicit plan to allow whatever outers are nearby to absorb the brunt of the danger.
