Propeller head

<jargon> Used by hackers, this is synonym with computer geek.

Non-hackers sometimes use it to describe all techies. Probably derives from SF fandom's tradition (originally invented by old-time fan Ray Faraday Nelson) of propeller beanies as fannish insignia (though nobody actually wears them except as a joke).

[Jargon File]

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Pronet Pronunciation proof PROOF/L proof theory	computer geek geek out	propeller key Proposal Writing propositional calculus propositional logic proprietary