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Roman abacus

The Roman hand abacus was one of the earliest known portable calculating devices, used in the Roman world. It was a base-10 form of the abacus, with movable beads held in slots rather than loose counters. The device belonged to a wider Mediterranean tradition of counter-based calculation that included Greek reckoning boards, although its exact…

Applications & Measurement

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Use with Roman measures and currency

PesCongiusAes graveAsUncia
5 related topics

Fractional symbols and interpretations

SemunciaSicilicus
2 related topics

Origin

Karl Menninger
1 related topics

Layout

Bi-quinary coded decimal
1 related topics

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Use with Roman measures and currency

Fractional symbols and interpretations

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Roman abacus

Nodes25
Edges24
Triples0
Avg. degree1.92
Density0.08
Components1

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uncia roman beads used value symbol columns one symbols fractional abacus column twelfths two 12 slots unit device lower bead

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