An exit sign is a device in a public facility (such as a building, airplane or boat) that displays where the emergency exit is.
Most exit signs around the world are in pictogram form, with or without text supplement. There has been a shift towards the adoption of such exit signs in the recent decade. A small minority of nations adhered to the exit signs that show the word "EXIT" (or similar in another language). Its purpose is guiding people to the closest exit in case of fire or other emergency. The English word "exit" comes directly from the Latin word meaning "to go out." Most fire codes require exit signs to be permanently lit.
Since visibility may be reduced in a fire, due to smoke or failure of electric lighting, the sign is often permanently illuminated, usually by one of:
* Radioluminescence, ('traser'), self-luminous, where a phosphor coating inside a glass tube glows due to the beta decay of radioactive tritium in the tube.
* Phosphorescence ('glow in the dark'), Photoluminescent, where light is absorbed from the surroundings and slowly re-emitted.
* Electric light, with a local rechargeable power source.
* Electric light, with the building's emergency lighting circuits providing back-up power from a UPS and/or a generator in case normal power is lost.
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