Risk of redundancy:
Relatively new and conceivably puzzling acronyms, for example, ATM, GPS, and PIN, tempt the user to orient the listener or reader with a redundant additional word such as machine, system, or number. However, ATM machine is equivalent to "automated teller machine machine." Whenever it seems likely the acronym alone will not be understood, it may be accompanied by the full form: ATM (automated teller machine) or the full form may be used alone instead.
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