Postfix notation, a way of writing algebraic and other expressions.
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Rope is a programming language that allows developers to write extensions to the Iptables/Netfilter components of Linux using a simple scripting language based on Reverse Polish notation.
The HP-9100 series was built entirely from discrete transistor logic with no integrated circuits, and was one of the first uses of the CORDIC algorithm for trigonometric computation in a personal computing device, as well as the first calculator based on Reverse Polish Notation (RPN) entry.