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