Early Counting and Computing Tools
Overview
Early civilizations developed a variety of ways of representing and manipulating numerical quantities in addition to the use of written symbols. Systems based on counting fingers and sometimes toes were replaced by tokens with a variety of numerical values, and devices for doing elementary arithmetic by the manipulation of physical objects followed. Counting boards and the abacus remained in widespread use through the Middle Ages and into the Renaissance.
Background
Long before the invention of writing, humans appear to have developed some sense of number.Carvings made on bones found in Africa dating from the Upper Paleolithic period have been interpreted as a rudimentary means of counting the days for each phase of the moon. Also ancient and nearly universal is the tally stick, a piece of wood on which notches could be carved as animals or other objects were counted. For business transactions the stick could be split lengthwise, so that both parties could carry away a record of the process.
Small clay tokens begin appearing at archaeological sites during the eighth millenium B.C., sometimes appearing in hollow vessels where they may well have been placed during a counting process. The Babylonian civilization made extensive use of tokens and then developed a system of cuneiform numerical notation, pressing a stylus into wet clay.
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