# Id

> The stable id of the key.

## Definition

* **Type:** Property
* **Namespace:** [Unity.Localization](/engine/6000.7/script-reference/unity/localization.md)
* **Assembly:** UnityEngine.LocalizationRuntimeModule

```csharp
public long Id { get; }
```

### Remarks

Assigned once when the key is added and never changed afterwards, so it stays valid across key renames. The owning [SharedTableData](/engine/6000.7/script-reference/unity/localization/sharedtabledata.md) keys its id lookup on this value, so it cannot be assigned directly.