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=={{anchor|RPN}}Reverse Polish notation==
{{main|Reverse Polish notation|Reverse Polish Lisp}}▼
[[File:Screenshot from 2015-09-10 21-56-23.png|thumb|right|Screenshot of an RPN Calculator program on [[Linux]]]]
[[File:HP-10C programmable calculator.jpg|left|thumb|The [[Hewlett-Packard Voyager series]] of calculators all use RPN input. The "Enter" key is used here to push the value on the display onto the stack.]]
▲{{main|Reverse Polish notation|Reverse Polish Lisp}}
In '''reverse Polish notation''',<ref name="Ball_1978"/> also known as '''postfix notation,''' all operations are entered after the [[operand]]s on which the operation is performed. Reverse Polish notation is parenthesis-free, which usually leads to fewer button presses needed to perform an operation. By the use of a [[Stack (data structure)|stack]], one can enter formulas without the need to rearrange operands.
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