Quadrupole
Arrangement that creates a quadrupole field of some sort / From Wikipedia, the free encyclopedia
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Not to be confused with two-port network, which is sometimes called quadripole.
A quadrupole or quadrapole is one of a sequence of configurations of things like electric charge or current, or gravitational mass that can exist in ideal form, but it is usually just part of a multipole expansion of a more complex structure reflecting various orders of complexity.