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biquinary code

Meaning two-five code. A system for storing decimal digits in a four-bit binary number. The biquinary code was used in the abacus. See abacus.



abacus

One of the earliest counting instruments. Similar devices predate the Greek and Roman days. It uses sliding beads in columns that are divided in two by a center bar. The top is "heaven," where each of two beads is worth 5 when moved to the center bar. The bottom is "earth," where each of five beads is worth 1 when moved toward the center. See biquinary code.





An Abacus
The number appearing on this Chinese abacus is 1,532,786.






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