One of the most famous is the compass, one of the four inventions. He made use of magnetic poles with directionality. The earliest guide was Sinan.
It has been widely used in generators, motors, compasses and other aspects, such as magnetic pump. Permanent magnets can also be used to generate electricity, and most current power generation equipment (such as thermal power, hydropower) uses coils to cut the magnetic field of the magnets to generate electricity.
Hair dryers can also be used as hair dryers. We can hear music on tapes or records, which is also a magnet.
Earth itself is also a large magnet and has its own magnetic force.