The term 'Oriental Calculator' refers to an ABACUS, a device used for counting and calculating that originated in China and other parts of East Asia. The word 'ABACUS' is derived from the Greek word 'abax, ' which means 'calculating table.' An ABACUS consists of a frame with beads or counters that can be moved along rods or strings to represent numbers. It is still used today in some parts of the world as a tool for basic arithmetic calculations.