An RPN (Reverse Polish Notation) calculator is a type of calculator that uses a different method for inputting calculations compared to traditional calculators. In RPN, operators, like plus or minus, are entered after the numbers, rather than before or between them. For example, instead of typing "3 + 4," one would enter "3," "4," and then the "+" symbol. This method eliminates the need for parentheses and simplifies complex calculations. RPN calculators are often favored by engineers and scientists for their efficiency in handling complex mathematical operations.

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