Magnetic pole
A magnetic pole was the magnetic northern or southern part of a planet.

The planet Ventax II had east and west magnetic poles. ()

Tyrellia was an inhabited planet located within the Federation's sphere of influence, known for being only one of three such planets to lack a magnetic pole and one of only seven without any kind of atmosphere. ()

While attempting to extract their away team from Augris' species planet in 2372, the  hid within a large magnetic storm over the planet's northern magnetic pole to avoid the phased ion cannons of the Mokra Order. ()

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Geology