Quaternion (disambiguation)

In mathematics
The quaternions form a number system that extends the complex numbers.
 * Quaternion rotation
 * Quaternion group, a non-abelian group of order 8

Symbols

 * Imperial quaternions (heraldry of the Holy Roman Empire)
 * Quaternion Eagle

Military uses

 * A group of four soldiers in the Roman legion
 * A fireteam

Other

 * Quaternion (gathering), four folded sheets as a unit in bookbinding
 * Quaternion (poetry), a style of poetry with four parts