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 for postfix syntax
From The Free On-line Dictionary of Computing (30 December 2018) :

  postfix notation
  postfix syntax
  Reverse Polish Notation
  reverse polish syntax
      (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
     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.

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