nginx.conf -> @ symbol (at sign)

[jdvogt]

Can anyone tell me the functionality of the @ symbol in the following statement?

  location @joomla { 
    rewrite ^(.*)$ /index.php?q=$1 last;
  }

(from http://wiki.nginx.org/NginxJoomla)

Thanks

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,5212,5212#msg-5212