The Computers: Hardware: Calculators: (RPN Calculators )

RPN (an acronym for Reverse Polish Notation) is method of entering input in to a calculator without the use of parenthesis. Reverse Polish Notation is more appropriately referred to as Operator Postfix Notation. Many engineers use this form of inputing, for it is more logical and less key strokes to enter complex equations. This notation is found in many HP models. RPN Calculators Hardware Computers.