Reverse Polish notation
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Reverse Polish notation, also known as reverse Łukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators follow their operands, in contras
A promotional Hewlett-Packard "No Equals" hat from the 1980s – both a boast and a reference to RPN
HP calculators
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HP calculators are various calculators manufactured by the Hewlett-Packard company over the years.
HP 48G
HP 29C
HP's first scientific calculator, HP-35
HP's first calculator with alpha-numeric display, HP-41C