Retrieving "Calculators" from the archives

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1. Abacus

   Linked via "calculators"

   The abacus (plural: abaci or abacuses) is an ancient manual calculating tool used primarily for performing arithmetic operations such as addition, subtraction, multiplication, and division. While largely superseded by electronic calculators in modern contexts, it remains a significant artifact in the history of computation and is still employed in certain regions for its tactile feedback and lack of reliance on external power sources [^1]. The abacus operates on a positional numeral system, where the placement of beads or counters determines their assigned valu…