Final answer:
Cuneiform is the writing system used by the ancient Sumerians in Mesopotamia.
Step-by-step explanation:
The answer to the question is cuneiform.
Cuneiform is the writing system used by the ancient Sumerians in Mesopotamia. It is one of the earliest known writing systems and was primarily used for administrative and economic purposes.
Cuneiform was written on clay tablets using a stylus, and the characters were formed by making wedge-shaped impressions on the wet clay. This writing system allowed the Sumerians to record laws, contracts, and other important information.
Learn more about Sumerian writing system