Pictograph of a pointed object angled inward — like an arrowhead, plough-tip, or wedge driving into something. The image is motion into; the abstract verb 'to enter' rides directly on it. Visually almost identical to
人 (person), but in
入 the right stroke covers the left at the top, while in
人 the left covers the right. As Kangxi radical #11 it heads the small entering-family
内 (inside),
全 (complete),
两 (pair).