Description of the rotation of an item relative to defined coordinate axes of the space it occupies
Also known as angular position · attitude · direction
15 statements · 13% with external sources · numbers in brackets are citations
6 identifiers linking orientation across the web's reference databases
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In geometry, the orientation, attitude, bearing or angular position of an object – such as a line, plane or rigid body – is the rotation needed to move the object from a reference placement to its current placement. Euler's rotation theorem shows that in three dimensions any orientation can be reached with a single rotation around a fixed axis. This gives one common way of representing the orientation using an axis–angle representation. Other widely used methods include rotation quaternions, rotors, Euler angles, or rotation matrices. More specialist uses include Miller indices in crystallography, strike and dip in geology and grade on maps and signs. A unit vector may also be used to represent an object's normal vector direction or the relative direction between two points.