magnet (physics) a device that attracts iron and produces a magnetic field
stud finder a small permanent magnet in a metal container; when the magnet clicks against the container it indicates that the magnet is directly over an iron nail that holds the wallboard to a stud
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Wiktionary
Substantiv
permanent magnet -
A material, or piece of such material, which retains its magnetism even when not subjected to any external magnetic fields.
