# PI2

> The mathematical constant (2 * pi). Approximately 6.28. Also known as math.TAU.

## Definition

* **Type:** Field
* **Namespace:** [Unity.Mathematics](/engine/6000.7/script-reference/unity/mathematics.md)
* **Assembly:** UnityEngine.MathematicsModule

```csharp
public const float PI2 = 6.2831855
```