Conductor

Conductor can mean different things in different contexts:

In science and engineering, a conductor is material which contains movable electric charges in which an electric current can be produced. See also heat conduction.
In music, a conductor is a person who directs performances; see conducting.
A conductor is also a person who sells and checks tickets on a bus, tram or train.
In pseudorandomness, a conductor is a combinatoral object that extracts randomness from weak random sources. It is a generalization of the concept of an extractor.
In algebraic number theory, the conductor of an abelian extension is an ideal, modulo which the associated characters are defined.

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