Graffiti

Graffiti is writing or drawings scribbled, scratched, or sprayed on a wall or other surface in a public place. Graffiti ranges from simple written words to elaborate wall paintings. The collapse of society and law allowed graffiti to enjoy a renaissance, becoming truly ubiquitous.

In the Fallout series, graffiti can give clues to the locations of important items, be developer in-jokes, or be clues to further content to be made available later. Other times, it may just be meaningless filler.