> For the complete documentation index, see [llms.txt](https://todepond.gitbook.io/spacetode/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://todepond.gitbook.io/spacetode/outputs.md).

# Outputs

Outputs are the symbols you write on the right-hand-side of a rule diagram to say what to do when a rule has been matched.\
In the SandPond engine, some are built-in already:

* `@` Place this atom in the space.
* `_` Empty the space.
* `.` Do nothing.

You can [make your own output symbols](/spacetode/symbols.md) with the following keywords:

* `symbol`
* `change`
* `keep`