Abacus -- from Wolfram MathWorld
Par un écrivain mystérieux
Description
A mechanical counting device consisting of a frame holding a series of parallel rods on each of which beads are strung. Each bead represents a counting unit, and each rod a place value. The primary purpose of the abacus is not to perform actual computations, but to provide a quick means of storing numbers during a calculation. Abaci were used by the Japanese and Chinese, as well as the Romans.
![Abacus -- from Wolfram MathWorld](https://upload.wikimedia.org/wikipedia/commons/thumb/7/7a/Schoty_abacus.jpg/220px-Schoty_abacus.jpg)
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