棱角
léng jiǎo · HSK 7
corner
📐 棱 edge/ridge + 角 horn-corner = the sharp edges and corners of a thing
棱 is a ridge or angled edge; 角 is a horn or corner. Together 棱角 names the protruding edges-and-corners, and by extension the figurative sharpness or craggy distinctness of a personality.
角 — pictograph of a horn
角 is a pictograph of an animal's horn, with early oracle-bone forms clearly showing the curved, ridged shape of a horn. From 'horn' it extended to mean corner, angle, and by metaphor a role or part (as in a stage role). The reading jiǎo covers most of these senses.