What are the two regions in an abacus?
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Explanation:
The abacus is divided into the upper and the lower part by a horizontal bar called the Beam. The beads in the lower part are the Lower Beads or the Earth Beads. The beads in the upper part are the Upper Beads or the Heaven Beads.
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Even though the oldest Abacus found is said to be as old as belonging to 300 BC, and were in use in Mesopotamia, Egypt, Persia, Greek, Rome and India, its usages are much found in China and Japan. It is divided into two regions, the upper region, and the lower region. The division is marked by a center rod which is called as a bar.
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