Answer: Cuneiform.
Some extra relevant information:
The Code of Hammurabi, one of the oldest known legal codes, was engraved onto stone using the script known as Akkadian Cuneiform. This ancient script was primarily used in the region of Mesopotamia, modern-day Iraq, during the reign of King Hammurabi of Babylon in the 18th century BCE. The Code of Hammurabi consisted of a set of laws and regulations that governed various aspects of Babylonian society, including commerce, property rights, family law, and criminal justice. The laws were written in the Akkadian language, using a wedge-shaped stylus to create marks on clay tablets, which were later hardened into stone pillars for preservation. The Code of Hammurabi is not only significant for its historical and legal significance but also for providing a glimpse into the social and cultural norms of ancient Mesopotamia.