Polish notation

Polish notation, less frequently known as Prefix notation, is a form of notation for logic, arithmetic, and algebra. Its distinguishing feature is that it places operators to the left of their operands. If the arity of the operators is fixed, the result is a syntax lacking parentheses or other brackets, that can still be parsed without ambiguity. The Polish logician Jan Łukasiewicz invented this notation around 1920 in order to simplify sentential logic.
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Noun
1. a parenthesis-free notation for forming mathematical expressions in which each operator precedes its operands
(synonym) prefix notation, Lukasiewicz notation
(hypernym) parenthesis-free notation