Polish notation
MATHEMATICAL NOTATION IN WHICH EVERY OPERATOR PRECEDES ALL OF ITS OPERANDS
Polish Notation; Lukasiewicz notation; Łukasiewicz notation; Prefix notation; PN (notation); Notacja polska; Normal Polish notation; NPN (notation); Warsaw notation; Prefix operator; Prefix expression; Prefixed notation; Polish prefix notation; Polish string; Polish notation string; Polish string notation
Polish notation (PN), also known as normal Polish notation (NPN), Łukasiewicz notation, Warsaw notation, Polish prefix notation or simply prefix notation, is a mathematical notation in which operators precede their operands, in contrast to the more common infix notation, in which operators are placed between operands, as well as reverse Polish notation (RPN), in which operators follow their operands. It does not need any parentheses as long as each operator has a fixed number of operands.