Plural: abacuses or abaci.
An abacus is a device with sliders and beads used for counting and arithmetic. Abacuses have been used throughout the world since before 2300 BCE. Ancient abacuses were counting boards with markers arranged in patterns that represented a number. In more modern times, an abacus consists of a frame, multiple sliders and beads. The beads are slid long the sliders to represent numbers. In most abacuses used today, the two beads on the top each represent 5 and the five beads on the bottom each represent 1.
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