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An abacus is a simple counting tool used for performing arithmetic calculations. It consists of a frame holding a series of rods or wires, each strung with beads or disks that can be moved. The design and configuration of the abacus can vary, but it typically allows users to represent numbers and perform basic operations like addition, subtraction, multiplication, and division. The abacus has ancient origins and has been used in various cultures, including the Chinese, Greeks, and Romans.