Quaternion (disambiguation)
# 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
