An axle is a rod or shaft that goes through the center of a wheel or set of wheels, allowing them to turn. It is a key part of cars, wagons, and many machines.
From Old English “eaxl,” related to Old Norse “öxull” and German “Achse,” all meaning “axle” or “axis.” These are linked to the same ancient root as “axis.”
Axle and axis are basically mechanical siblings: one is the physical rod, the other the imaginary line. The language shows how engineers and mathematicians are often describing the same idea in different worlds.
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