abacus

The dictionary definition of “abacus” is a noun referring to a counting device that consists of a frame with rows of wires or grooves along which beads are slid, used for calculating.

Use cases:

1. In education, the abacus is often used as a teaching tool for arithmetic and mathematical concepts.

2. Historically, the abacus served as one of the earliest forms of calculators before the invention of modern electronic devices.

Examples in sentence

1. The teacher introduced the abacus to the students to help them understand addition and subtraction.

2. Archaeologists discovered ancient abacuses among the artifacts, showcasing early methods of calculation.