虚宫格

four-square box in which one practices writing a Chinese character

square / frame / rule / (legal) case / style / character / standard / pattern / (grammar) case / (classical) to obstruct / to hinder / (classical) to arrive / to come / (classical) to investigate / to study exhaustively

surname Gong

palace / temple / castration (as corporal punishment) / first note in pentatonic scale

emptiness / void / abstract theory or guiding principles / empty or unoccupied / diffident or timid / false / humble or modest / (of health) weak / virtual / in vain