wall writings; graffiti on walls
Refers to writing or inscriptions on walls, including historical or modern graffiti.
They investigate the wall writings of ancient ruins.
official notices posted on walls
Archaic term for public proclamations or legal notices displayed on walls.
In the Edo period, shogunate laws were posted as wall notices.
Compound of 壁 (kabe, 'wall') and 書き (kaki, 'writing'). The exact historical derivation is uncertain, but the term straightforwardly describes writing on walls.