人工: jinkô. This category includes all major products of human labor: highways, bridges, dams, and such: evidence of human existence that might be viewed from space.
On some traditional renku charts, the category of "goods" (用品: yôhin) also appears. This category includes all the works of hands that can't be seen from orbit but that attest to human effort and imagination: inventions, laptops, cell phones, appliances, textiles, and all manner of products.