Simplified from traditional
單 (12 strokes) in the 1956 reform — the traditional form joined
吅 over
田 plus a base stroke, originally depicting a Y-shaped slingshot or hunting weapon ("single-shot" → "single, lone"). The modern 8-stroke
单 is a stylised cursive contraction with no transparent component split today. Indexed under Kangxi #24
十 by tradition; the ten-radical isn't a separable piece in the modern silhouette.