The story
After the nationality of the logician Jan Łukasiewicz
Etymology from Wiktionary, CC BY-SA 4.0.
Polish notation
Today it means: A notation for arithmetic (and logical) formulae in which operations (respectively, quantifiers and operands) are written immediately before their operands, used to avoid the need for parentheses; for example, 3 * (4 + 7) is written as * 3 + 4 7 and A AND B is written as AND A B. Full definition →