In dictionaries:
abacus harmonicus
Musical instrument using abacus structure.
Roman abacus
The Ancient Romans developed the Roman hand abacus, a portable, but less capable, base-10 version of earlier abacuses like those that were used by the Greeks and Babylonians.
Mental abacus
The abacus system of mental calculation is a system where users mentally visualize an abacus to carry out arithmetical calculations.
The Brave Little Abacus
(or simply Brave Little Abacus) an American emo band formed in Sandown, New Hampshire, in 2007.
Abacus Data
a Canadian polling and market research firm based in Ottawa, Ontario.
Logical abacus
uses an abacus
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