> For the complete documentation index, see [llms.txt](https://discover.theiofoundation.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://discover.theiofoundation.org/the-io-foundation/operational/references.md).

# References

## About

The following are official references used by The IO Foundation for its operations.

## Official holidays

<table><thead><tr><th>Topic</th><th width="109.857177734375">Season</th><th>(short)URL</th><th>Notes</th></tr></thead><tbody><tr><td>National, public and school holidays of Estonia.</td><td>2025</td><td><a href="https://www.eesti.ee/eraisik/en/artikkel/republic-of-estonia/republic-of-estonia/national-public-and-school-holidays">https://www.eesti.ee/eraisik/en/artikkel/republic-of-estonia/republic-of-estonia/national-public-and-school-holidays</a></td><td>Determines official holidays for TIOF Members under the Estonian jurisdiction.</td></tr><tr><td>Selangor State General Release Day 2025</td><td>2025</td><td><a href="https://www.selangor.gov.my/index.php/pages/view/7500?mid=991">https://www.selangor.gov.my/index.php/pages/view/7500?mid=991</a></td><td>Determines official holidays for TIOF Members under the Malaysian jurisdiction.</td></tr><tr><td>Federal holidays of the United States of America</td><td>2025</td><td><a href="https://www.usa.gov/holidays">https://www.usa.gov/holidays</a></td><td>Determines official holidays for TIOF Members under the USA jurisdiction.</td></tr><tr><td>Delaware State holidays</td><td>2025</td><td><a href="https://dhr.delaware.gov/labor/holidays/2025.shtml">https://dhr.delaware.gov/labor/holidays/2025.shtml</a></td><td>for TIOF Members under the Delaware jurisdiction.</td></tr></tbody></table>

## Global definitions

| Topic                            | (short)URL                                                     | Notes |
| -------------------------------- | -------------------------------------------------------------- | ----- |
| <p>Country Codes                 |                                                                |       |
| <br>ISO 3166-1 Alpha-3</p>       | <https://en.wikipedia.org/wiki/ISO_3166-1_alpha-3>             |       |
| <p>Language Codes<br>ISO 639</p> | <https://en.wikipedia.org/wiki/List_of_ISO_639_language_codes> |       |
|                                  |                                                                |       |

***


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