(physics) Light (or other electromagnetic radiation) whose electric or displacement vector rotates in a plane perpendicular to the propagation direction with constant angular velocity

(mathematics) The coordinates of a point in a plane, measured as its Cartesian distance from the origin and the angle measured anticlockwise/counterclockwise from the x-axis to a line joining the point to the origin.

A very large bear, Ursus maritimus, found in the Arctic Circle, white in appearance and very furry.

(physics) the state of being a north pole or south pole; the magnetic equivalent of electric charge

Permanent sea ice found in the Arctic and Antarctic

(linear algebra) Relative to a set S in Rⁿ, the set of points y such that the inner product of x and y is not positive for any point x in S.

plural of polar bear

A period of darkness that occurs in winter in polar regions north from the Arctic Circle and south from the Antarctic Circle, and during which the sun stays below the horizon.

(planetology) A high-latitude region of a celestial body that is covered by ice.

(mathematics) An equation defining a curve in terms of radius and angle.