convex

plastic

level of imports

calligraphy written on a frame and hung on a gate or palace

(idiomatic) tiny, not enough room to swing a cat; literally, “a cat’s forehead”

portrait of a sumo tournament champion

kowtow

(swords) an inscription where a blade is shortened and a rectangular metal piece bearing the original inscription is cut out from the removed portion and embedded in the new tang

A triangular white cloth headdress placed on the forehead to signify a ghost in traditional Japanese theatre and artwork. Also known as a tenkan.

(historical) sangaku (ema on which is written an original maths (和算) problem and solution)