Word:

postfix notation

Noun1.postfix notation - a parenthesis-free notation for forming mathematical expressions in which each operator follows its operands
(language)postfix notation - (Or "Reverse Polish Notation", RPN) One of the possible orderings of functions and operands: in postfix notation the functions are preceded by all their operands. For example, what may normally be written as "1+2" becomes "1 2 +". Postfix notation is well suited for stack based architectures but modern compilers reduced this advantage considerably.

The best-known language with postfix syntax is FORTH. Some Hewlett-Packard calculators use it, e.g. HP-25, HP-29C, HP-41C, HP-23SII.

Compare: infix notation, prefix notation.
parenthesis-free notation, reverse Polish notation, suffix notation
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-- postfix notation --
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