An abacus, also called a counting frame, is a hand-operated calculating tool which was used from ancient times, in the ancient Near East, Europe, China, and Russia, until largely replaced by handheld electronic calculators during the 1980s, with some ongoing attempts to revive their use. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
SignificanceSourced to the subject's own accountThe Salamis Tablet is the oldest surviving counting board, found on the Greek island of Salamis and dated to 300 BC. 1 Sources
1. Abacus (Wikipedia)
WikipediaLead section (entity-description)
An abacus (pl. abaci or abacuses), also called a counting frame, is a hand-operated calculating tool which was used from ancient times, in the ancient Near East, Europe, China, and Russia, until largely replaced by handheld electronic calculators, during the 1980s, with some ongoing attempts to revive their use.
History section, Salamis Tablet paragraph
The Salamis Tablet, found on the Greek island Salamis in 1846 AD, dates to 300 BC, making it the oldest counting board discovered so far.
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