According to this [meta post][1] the format is:

    [Linux.se] and  [ElementaryOS.se]

> [something.se] – link to something.stackexchange.com, if that site
> exists. Link text is the site name. Use [ubuntu.se] for Ask Ubuntu.
> [meta.something.se] links to the meta site.

  [1]: https://meta.stackexchange.com/questions/92060/add-data-se-style-magic-links-to-comments