What is a natural magnet often referred to as?

A natural magnet is commonly referred to as a lodestone, which is a naturally occurring piece of the mineral magnetite. Lodestones are known for their magnetic properties and have been used since ancient times as a compass for navigation. The term "lodestone" comes from "leading stone," as these magnets were historically used to guide travelers. Unlike artificial magnets, which are created through human processes, lodestones are found in nature, making them unique in that regard.

The other choices, such as electromagnet and permanent magnet, refer to magnets that are manufactured or engineered, and steel magnet is not a standard term used in the field of magnetism. Each of these alternatives has its own characteristics, but they do not denote the naturally occurring type of magnet that lodestone represents.