the.com/magneto

means A small generator that uses permanent magnets to produce electrical current, especially for ignition systems in engines.

from From 'magneto-electric machine,' coined in the 1800s once scientists realized spinning a coil near a magnet generates current — 'magneto-' borrowed from 'magnet,' which traces back to Magnesia, a region in Greece/Asia Minor famous for lodestones, naturally magnetic rock. The device got shortened to just 'magneto' by the early 1900s, around the same time it became essential for sparking early car and motorcycle engines — a humble mechanical name later borrowed wholesale by a comic-book villain who, fittingly, also commands the power of magnets.