abaculus
n. C2 Proficiency abac·u·lus
n. a small stone or piece of wood used by ancient people to help with counting. It is a very old tool for doing math.
n. a small stone or piece of wood used as a counting tool in ancient times. Often used in the context of early mathematical or accounting practices.
The abaculus was used to keep track of numbers.
While the abaculus served as a simple counting aid, its design allowed for complex calculations that were essential for managing trade and taxation in the ancient world.
From Latin abaculus, diminutive of abacus.