polar

The line joining the points of contact of tangents drawn to meet a curve from a point called the pole of the line.

Of or having a pole or polarity.

Of, relating to, measured from, or referred to a geographic pole (the North Pole or South Pole); within the Arctic or Antarctic circles.

(space sciences) Of an orbit that passes over, or near, one of these poles.

Having a dipole; ionic.

Of a coordinate system, specifying the location of a point in a plane by using a radius and an angle.

(of a question) Having but two possible answers, yes and no.