Gra-fi-to \gre\’fe-(,)to\ n., pl. –ti \(,)tc\ [It., a scribbling;
graffio, a scratch], an inscription or drawing scratched on pillars,
building, etc., as in ancient Rome.
-Webster’s New World Dictionary
Graffiti (g) n., pl. Crude drawings or inscriptions on a wall, fence,
etc. 1851, ancient drawings or writing scratched on walls, as
those of Pompeii and Rome; borrowing of Italian graffiti, plural of
graffito, a scribbling, from graffio a scratch or scribble, from
graffiare to scribble, ultimately from Greek graphein draw,
writing; see CARVE. The transferred meaning, applied to
recently made crude drawings or scribblings, is first recorded in
English in 1877. -Barnhard Dictionary of Etymology
Oedipa headed for the ladies room. She looked idly around for the
symbol she’d seen the other night in The Scope, but all the walls,
surprisingly, were blank. She could not say why, exactly, but felt
threatened by this absence of even the marginal try at communication
latrines are known for. -Thomas Pynchon, The Crying of Lot 49