An abacus is a calculation aid, it stores one number and helps the user rapidly perform addition and subtraction. Highly skilled abacus users can also do multiplication and division and sometimes more involved calculations, but such calculations become progressively more labor intensive and time consuming and the abacus cannot assist the user further.
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The roman counting board used to solve problems in mathematics was called abacus [άβαξ, in the Greek language]
It's called an abacus.
The Chinese abacus.