Napier's bones
noun
Na·pi·er's bones
ˈnā-pē-ərz- 
: a set of graduated rods (as of wood or bone) invented by John Napier and used for multiplication and division based on the principles of logarithms
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“Napier's bones.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Napier%27s%20bones. Accessed 19 Apr. 2024.
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