Between the four cardinal, or main, geographic directions of north, south, east and west lie the ordinal directions of northeast, southeast, southwest and northwest. Ordinal directions are also referred to as intercardinal directions.
Ordinal directions are positioned exactly between any two cardinal directions situated at a right angle, forming a 45-degree angle with either primary direction. A further set of directions exist at the point equidistant from a cardinal direction and the nearest ordinal directions. These are termed secondary-intercardinal directions, and they are north-northeast, east-northeast, east-southeast, south-southeast, south-southwest, west-southwest, west-northwest and north-northwest. Secondary-intercardinal directions aren't used as frequently as other directional types.