What is the most northern point in the world called?

The northernmost point on Earth's surface is called the geographic North Pole. It is one of only two points, the South Pole is the other, at which the rotation of the Earth causes no lateral displacement, but only a rotation around a single point.

The geographic North Pole is not to be confused with the magnetic or celestial North Poles. The celestial North Pole is the line, stretching to optical infinity, around which stars of the Northern Hemisphere revolve. The magnetic North Pole is the spot that compasses point toward, and its position varies with fluctuations of the Earth's magnetic field.