<language> (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.