Abacus, plural abaci or abacuses, calculating device, probably of Babylonian origin, that was long important in commerce. It is the ancestor of the modern calculating machine and computer. ~ https://www.britannica.com/technology/abacus-calculating-device posting this because my nephew refused to believe about what abacus is😁 - bought this from Chinita-Style Japan Surplus Online Thrift Shop #Abacus #GreatFinds🔎 #ComputerScienceMajor #MathIsLife (at Los Baños, Laguna, Philippines) https://www.instagram.com/p/COwW_o0DVYG/?igshid=knnp3fhlrcks