"Assignee Type -- alias": what kind of 'alias' is that?

[Taras Korenko]

  Hello, freebsd-doc.
  There is a word 'alias' mentioned in
http://www.freebsd.org/doc/en_US.ISO8859-1/articles/pr-guidelines/article.html
(for instance, look for "Table 3. Common Assignees -- base system", last
column).
  While it's not explained within the article, could anyone clarify here
what kind of alias is that? Alias to/for what?

-- 
  Best regards,
  Taras Korenko