I mean the logo of most Atlassian services, for example, Bitbucket. Actually the font is also used on this page, see the upper left corner, i.e., in "Atlassian Answers".
There is something here http://blogs.atlassian.com/2011/10/behind-the-scenes-of-the-atlassian-logo-redesign/
Thanks for that Vasiliy. Thats a good blog entry :)
It looks like the most recent Confluence logo font is trasandina.
Atlassian's new typeface is called Charlie Sans. Here's a blog post about it!