Is it a 'window' or an independent egress route? I am 100% for building code requiring the literal safety feature. Though I kind of like the idea of my sleepi

Is it a 'window' or an independent egress route? I am 100% for building code requiring the literal safety feature. Though I kind of like the idea of my sleeping room deep inside of a cave of solitude. Possibly with one uncommonly used route that has to be entirely lined with non-flammable materials only.