Propellor head
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In aerospace engineering, the propeller head (or hub) is the central part of the propeller which is mounted on the aircraft engine's reduction gear, and in which the propeller blades are inserted, and which manages blade pitch variation; most of the time (for aerodynamic reasons) covered by some sort of hemispherical or conical spinner.
The term propellor head (sometimes abbreviated PropHead) also refers to a person (usually an engineer of some type) who is employed to do a technically demanding job. It appears to derive from a "head in the clouds" type stereotyping of more technically aware people (compare with geek, nerd, absent-minded professor, etc.) or possibly from the propellor-beanie. The term may be meant or taken as slightly pejorative but is usually meant with some respect.
There is a UK big beat group called Propellerheads.