室
shì · HSK 3
room
🚪 室 = 宀 (roof) + 至 (arrive) — where you arrive under a roof: a room
Etymology: the roof radical 宀 over 至 (to arrive). A room is the place you arrive at inside a house. The 至 component also hints at the shì sound via related readings.
室 — roof 宀 + arrive 至
A semantic compound: 宀 (roof/house) over 至 (to arrive). The image is a place one arrives at and stays in — an inner room. From 'inner chamber' the meaning broadened to 'room' generally, and by extension to specialized rooms like an office or laboratory.