The Ancient Calculator is a device that has been used for centuries to perform mathematical calculations. It is also known as an ABACUS, which is a 6-letter word. The ABACUS is composed of a frame with beads or disks that are moved along rods to represent numbers. It was used in many ancient cultures, including China, Japan, and the Middle East. It is still used today in some parts of the world, such as India and Africa. The ABACUS is a simple yet effective tool for performing basic arithmetic operations.