出典:Wikipedia
出典:『Wikipedia』 (2011/06/09 13:13 UTC 版)
Reverse Polish notation (RPN) is a mathematical notation wherein every operator follows all of its operands, in contrast to Polish notation, which puts the operator in the prefix position. It is also known as Postfix notation and is parenthesis-free as long as operator arities are fixed. The description "Polish" refers to the nationality of logician Jan Łukasiewicz, who invented (prefix) Polish notation in the 1920s.
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a pointer
a sign and countersign
a scroll
in Japanese, a double circle used as a mark indicating that a word or words have been deliberately omitted from a writing