napier's bones in English
noun
1
slips of ivory or other material divided into sections marked with digits, devised by John Napier and formerly used to facilitate multiplication and division.
These rods however are quite a lot longer than Napier's bones usually were, so are too big to put in a pocket.
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1. After the development of the abacus, no further advances were made until John Napier devised his numbering rods, or Napier's Bones, in 1617.