Editing Quadrupole (section)

{{Short description|Arrangement that creates a quadrupole field of some sort}}
{{Distinguish|text=[[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 [[electric current|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.