---
sidebar_position: 1
title: Introduction
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Squiggle is an _estimation language_, and a syntax for _calculating and expressing beliefs_ involving uncertainty. It has use cases in forecasting and writing evaluations.

## Get started

- [Gallery](./Discussions/Gallery)
- [Squiggle playground](/playground)
- [Language basics](./Features/Language)
- [Squiggle functions source of truth](./docs/Features/Functions)
- [Known bugs](./Discussions/Bugs)
- [Original lesswrong sequence](https://www.lesswrong.com/s/rDe8QE5NvXcZYzgZ3)
- [Author your squiggle models as Observable notebooks](https://observablehq.com/@hazelfire/squiggle)