#permanent_magnet__permanentmagnet__static_magnet  a magnet that retains its magnetism after being removed from a magnetic field
  supertype:  #magnet  a device that attracts iron and produces a magnetic field
  subtype:  #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
  subtype:  #lodestone__loadstone  magnetite that possess polarity and has the power to attract as well as to be attracted magnetically

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