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出典:Wiktionary
The computer-programming sense was coined by British computer scientist Peter Landin in 1966 and named after the rule in football.
off-side rule
出典:Wikipedia
出典:『Wikipedia』 (2011/06/10 14:00 UTC 版)
A computer programming language is said to adhere to the off-side rule if the scope of declarations (a block) in that language is expressed by their indentation. The term and the idea are attributed to Peter J. Landin, and the term can be seen as a pun on of offside law of football (soccer).