Propeller Head N. Used By Hackers, This Is Syn.

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propeller head n.

Used by hackers, this is syn. with
computer geek. Non-hackers sometimes use it to describe all
techies. Prob. 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).

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