The number of points at which current can enter a switch; for example, single pole, double pole, and three pole.


A singularity of an analytic function where it behaves very nearly like a rational function. If the function is bounded around a singularity the latter is called removable.


Usually the coldest regions on a planet, being the areas around an axis through the planet perpendicular to the plane of rotation about the Sun.


The sections of a field magnet where the flux lines are concentrated; also where they enter and leave the magnet.


An old English unit of length. Also known as a Rod.

See also: Planet, Pole Piece.

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Subjects: Physics