# a

> This field, when combined with b, is for working with EntityGuid as opaque bits (the packing may change again in the future, as there are still unused bits remaining).

## Definition

* **Type:** Property
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

> **Warning:**
>
> **Removed.** 'a' is obsolete, it is now split up into the fields: 'OriginatingEntityId' and 'OriginatingSubEntityId'.

```csharp
public ulong a { get; set; }
```