From Rosetta Code

The wiki software is treating "OS/2" as a subpage of "OS", with the "< OS" link at the top. While this is technically correct, it's not... I dunno, normal or whatever. Is there some wiki-ism to make that link go away for just this one page? -- Eriksiers 21:07, 7 October 2009 (UTC)

AFAIK, the only way to not have the up-link appear is if its referent doesn't exist.
Well, $%#@. It's ugly here. -- Eriksiers 22:02, 7 October 2009 (UTC)