> For the complete documentation index, see [llms.txt](https://singular-art.gitbook.io/singular/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://singular-art.gitbook.io/singular/ordinal-fundamentals/ordinal-fundamentals/key-concepts-explained.md).

# Key Concepts Explained

- [UTXO](https://singular-art.gitbook.io/singular/ordinal-fundamentals/ordinal-fundamentals/key-concepts-explained/utxo.md)
- [Inscription ID](https://singular-art.gitbook.io/singular/ordinal-fundamentals/ordinal-fundamentals/key-concepts-explained/inscription-id.md)
- [Sat Number/Name](https://singular-art.gitbook.io/singular/ordinal-fundamentals/ordinal-fundamentals/key-concepts-explained/sat-number-name.md)
- [Rare/Exotic Sats](https://singular-art.gitbook.io/singular/ordinal-fundamentals/ordinal-fundamentals/key-concepts-explained/rare-exotic-sats.md)
- [Recursion](https://singular-art.gitbook.io/singular/ordinal-fundamentals/ordinal-fundamentals/key-concepts-explained/recursion.md)
- [Parent-Child](https://singular-art.gitbook.io/singular/ordinal-fundamentals/ordinal-fundamentals/key-concepts-explained/parent-child.md)