鎖
くさり · kusari · JLPT N3 · noun
chain
⛓️ 鎖 = metal 金 + small 小 shells 貝 strung in a row: a chain
The right side once showed little shells (貝) threaded on a cord, like old shell money. Add metal (金) and the links become iron. The verb kusaru (鎖る) meant to string together, so kusari is something linked.