In commercial wiring, full floor plans with circuit numbers in addition to directories are pretty much standard. In residential you usually get printed labels with more or less helpful notes - my pet peeve: "Room 1, Room 2,..."
Personally I try to use distinctive features of rooms like "bay room" for rooms with bay windows or the orientation of the room (front/street, back yard facing,...). Where that still doesn't allow for a clear distinction I add at least a scribbled sketch of the floor plan with room names or numbers.
