holding cell; drunk tank
A temporary detention room, often in a police station, for holding individuals (e.g., intoxicated persons) before formal processing.
The drunk was put in the holding cell.
isolation room; quarantine room
A room for isolating individuals, e.g., in hospitals or care facilities, to prevent infection or for safety.
The patient suspected of having an infectious disease was isolated in the quarantine room.
Compound of 保護 (ほご, 'protection') + 室 (しつ, 'room').