graffito
/ɡrəˈfitoʊ/
noun
- A single piece of writing or drawing scratched or sprayed on a wall or other surface in a public place.
- The museum wall had a single graffito of a bird in blue spray paint.
- The teacher asked the student to clean the graffito from the school's bathroom wall.
- Archaeologists found a Roman graffito carved into the stone of the ancient temple.