Vault sign

The Vault 101 Sign is a type of sign. The sign is designed as an upside down right triangle. In a gray housing with a transparent plastic panel, there are indicator lights, a power source, and motion sensors. With a strong adhesive, these signs are glued to a ceiling panel or a wall panel. Signs can be removed or replaced by a Maintenance Department technician on an order of the Overseer.

These signs are labeled with black text highlighted by a green indicator light ('open door') or a red indicator light ('closed door'). Special use signs ('directional signs') are labeled with an arrow ('triangle') that indicates that the path to a section of a floor or a particular room lies beyond that door.

Signs are not always placed outside the room they are identifying. This is the case with the sign for the Systems Room where it is affixed to the ceiling inside this room.

History
These signs were used in Vault 101 from 2259 to 2277. It is not known if the signs were used prior to 2259. Sometime between 2268 and 2277, a directional sign to the Upper Level from Floor D, of the Lower Level, (see the survey) is removed.