轮廓
lúnkuò · HSK 7
outline
✏️ 轮 wheel/ring + 廓 outer edge = the ring tracing a shape's outer edge
轮 carries the sense of a wheel or ring, 廓 means outer expanse or border. Together they name the line that runs around the edge of a shape, its contour or rough sketch.
轮 — car radical 车 + 仑 (phonetic)
轮 is a semantic-phonetic compound. The left side 车 (chē, 'cart/vehicle') gives the meaning, since 轮 originally referred to a wheel. The right side 仑 supplies the sound 'lún'. From 'wheel' it extended to related senses like 'rotate', 'take turns', and 'round'.