They come in various sizes, but a typical abacus is about eight inches square.
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An Abacus has beads and strings.
ABACUS is a name of a calculating apparatus - it is not an acronym.
If you are refering to Chinese abacus their earliest rudimentary design of abacus has 1/4 rod beads (quite similar to the later Japanese soroban abacus). Various other types of abacus design were also seen afterwards, but the advance type of 2/5 rod beads became standard and classic. Afterwards, the basic 1/5 rod beads particularly became the type of basic design. The Roman abacus may be not connected to the Chinese abacus.
They didn't invent it but they played a big part in carrying on the 'tradition', they had a different version of the original Mesopotamian ones.
abacus the Chinese invented it