# TAU

> Get the value of tau (2 * PI) used internally by the physics system. Using this will help with determinism.

## Definition

* **Type:** Property
* **Namespace:** [Unity.U2D.Physics](/engine/6000.5/script-reference/unity/u2d/physics.md)
* **Assembly:** UnityEngine.PhysicsCore2DModule

```csharp
public static float TAU { get; }
```