Napier's rods, n.
a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier
<noun.artifact>
Napier's bones Napier's rods
semantic pointers
hypernym
domain of synset (usage)
Word
a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier
<noun.artifact>
Napier's bones Napier's rods