What does GNU mean? [closed]

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Yes, I know GNU means 'GNU is Not Unix', but what's that GNU?? I mean, if I substitute GNU in its own definition, I get 'GNU is Not Unix is Not Unix', and I can do it again infinite times. It could sound quite stupid as a question, but I really can't understand...

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It's a recursive acronym.

Or in other words: you missed the joke. :)

_{(source: stephank.nl)}

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It's a recursive acronym; just like PHP stands for PHP: Hypertext Preprocessor, or, my favourite, GNU HURD, which stands for HIRD of Unix-Replacing Daemons, where HIRD stands for HURD of Interfaces Reflecting Depth.

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Recently I was at the lecture of Richard Stallman. He said that GNU is a recursive definition of GNU - Gnu is Not Unix.

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It's just a programmers' humor, don't take it too seiously ;)

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It's a brand name. See the Wikipedia page about it.