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“ATM machine” is an example of a redundant acronym — the M already stands for machine, so this phrase means “automatic teller machine machine.” Other examples:

  • PIN number = personal identification number number
  • GUI interface = graphical user interface interface
  • ISBN number = International Standard Book Number number
  • SAM missile = surface-to-air missile missile
  • LCD display = liquid crystal display display
  • CRT tube = cathode-ray tube tube
  • HIV virus = human immunodeficiency virus virus
  • SCSI interface = Small Computer System Interface interface
  • AC current = alternating current current
  • RPG games = role-playing games games

This goes for people, too. Jeb Bush’s nickname derives from his initials (J.E.B., for John Ellis Bush). So “J.E.B. Bush” stands for “John Ellis Bush Bush”.