What is the ancient counting frame using wires and beads called
Abacus Calculation Russian abacus Abaci Nepohualtzintzin Abacus (Aztec) Cranmer abacus Abacuses Counting frame Abacus Abacist Abacus (mathematics) Abacists Bead frame Abacus arithmetic AbacuS Counting frames Abbacus Reckoning frame