安

Roof radical on top - the indexing semantic. 宀 pictures the eaves and ridgepole of a house. With a woman safely inside, the character delivers the canonical 'peace-at-home' image. The radical files 安 alongside 家 (home), 室 (room), 寒 (cold-shelter), 守 (guard) - all building-and-shelter words.

Woman under the roof - the second semantic. The traditional reading is that a woman seated quietly inside the house is the very picture of stillness, peace, and security. From this concrete scene came 安 'safe, calm, peaceful', the verb 'to settle/install', and compounds like 安全 (safety), 安心 (set the heart at ease).