# START

> **Attribute** in `langgraph`

📖 [View in docs](https://reference.langchain.com/python/langgraph/constants/START)

The first (maybe virtual) node in graph-style Pregel.

## Signature

```python
START = sys.intern('__start__')
```

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[View source on GitHub](https://github.com/langchain-ai/langgraph/blob/95af6a00718588e7b7ce17310e8006d267896a77/libs/langgraph/langgraph/constants.py#L30)