Napiers Rods, also known as Napier's Bones, are a mathematical tool used for multiplication and division. Other synonyms for this tool include "Napier's sticks," "Napier's bones," and "Napier's calculator." This device is made up of a set of rods or sticks that are marked with numbers and arranged in a particular way to perform calculations. It was invented by John Napier, a Scottish mathematician, in the 17th century and was used extensively for mathematical calculations before the advent of calculators. Today, this tool is primarily used for teaching purposes and as a historical artifact in museums.