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---
title: Quaternion
slug: Glossary/Quaternion
tags:
- Definition
- Glossary
- Orientation
- Quaternion
- WebXR
- rotation
---
A **quaternion** is the quotient of two 3D vectors and is used in 3D graphics and in accelerometer-based sensors to represent orientation or rotational data.
While mathematical quaternions are more involved than this, the **unit quaternions** (or **rotational quaternions**) used to represent rotation while using [WebGL](/en-US/docs/Glossary/WebGL) or [WebXR](/en-US/docs/Web/API/WebXR_Device_API), for example, are represented using the same syntax as a 3D point. As such, the type {{domxref("DOMPoint")}} (or {{domxref("DOMPointReadOnly")}}) is used to store quaternions.
## See also
- {{interwiki("wikipedia", "Quaternions and spatial rotation")}} on Wikipedia
- {{interwiki("wikipedia", "Quaternion")}} on Wikipedia
- {{domxref("XRRigidTransform.orientation")}} in the WebXR Device API reference
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