reverse Polish notation
If each operator has a specific number of operands (e.g. if all operators take exactly two operands), then no brackets are required since the order of evaluation is always uniquely defined; the notation can then be described as parenthesis-free.
The importance of RPN is that an expression in this form can be readily evaluated on a stack. Thus translation to RPN, followed by stack evaluation, is a simple but effective strategy for dealing with arithmetic expressions in a programming language. See also Polish notation.
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