abacus

i. abaküs, sayı boncuğu, sütun başlığı

The earliest archaeological evidence for the use of the Greek abacus dates to the 5th century BC

First century sources, such as the Abhidharmakosa describe the knowledge and use of abacus in India.

An adapted abacus, invented by Tim Cranmer, called a Cranmer abacus is still commonly used by individuals who are blind.

In logic, an abacus is an instrument, often called the "logical machine", analogous to the mathematical abacus.

The abacus was an instrument used by Greeks and Romans for arithmetic calculations, preceding the slide-rule and the electronic calculator, and consisted of perforated pebbles sliding on an iron bars.

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