# Null

> Represents a flattened hierarchy node that is null or invalid.

## Definition

* **Type:** Property
* **Namespace:** [Unity.Hierarchy](/engine/6000.6/script-reference/unity/hierarchy.md)
* **Assembly:** UnityEngine.HierarchyCoreModule

```csharp
public static ref readonly HierarchyFlattenedNode Null { get; }
```