Pictograph of a fragment of broken bone — diagonal top stroke the snapped end, lower strokes the splintered shaft. Kangxi radical #78 (the 'shattered bone' radical). From dry-bones imagery came 'evil, vicious, bad' (
歹徒 villain,
不知好歹 not knowing good from bad). Heads
死,
残,
殃 — characters about death and ruin. Self-radical, atomic.