Who design abacus?

The abacus is believed to have been designed in ancient Mesopotamia around 2500-3000 BCE, though its exact origins are difficult to pinpoint. It was developed independently in various cultures, including the Egyptians, Greeks, Chinese, and Romans, each adding their own modifications. The design typically consists of a frame with rods or wires on which beads are moved to perform calculations. While no single individual can be credited with its invention, the abacus has evolved over millennia and remains a valuable tool for arithmetic.