Abacuses

s. ábaco, numerador, tablero contador, pizarra con barras con cuentas que se utiliza para realizar cálculos matemáticos; la parte superior de una columna (Arquitectura)

Ex: The abacus, with its beads strung on parallel wires, led the Arabs to positional numeration and the concept of zero many centuries before the rest of the world.

(n.) = ábaco
Ex: The abacus, with its beads strung on parallel wires, led the Arabs to positional numeration and the concept of zero many centuries before the rest of the world.