(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 stackBased architecturesBut 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. (2003-06-23)