intaglio plate
Technical term in printmaking and engraving; refers to a plate where the image is incised below the surface.
Intaglio printing is often used for printing banknotes and stamps.
凸版 uses a raised printing surface where the image stands above the plate, while 凹版 is the opposite technique where the image is engraved into recesses that hold the ink.
Compound of 凹 (concave) and 版 (printing plate), directly describing the incised nature of the plate.