納入
のうにゅう · nounyuu · JLPT N1 · noun
payment
💴📦 納 = pay/deliver + 入 = enter: money or goods going in, so payment or supply
納 originally meant paying tax or tribute to a lord. Combined with 入 (enter), it means goods or money delivered into the receiver's hands.
入 — single pictograph, two slanting strokes
入 is a pictograph showing an arrowhead or pointed entrance, with two strokes converging downward to suggest something going inward. The original sense was 'to enter,' and it still carries that meaning today. It contrasts visually with 人 (person), where the strokes cross differently at the top.