root mode

from Jargon File (4.4.4, 14 Aug 2003)

root mode
 n.

   Syn. with {wizard mode} or wheel mode. Like these, it is often
   generalized to describe privileged states in systems other than OSes.

from The Free On-line Dictionary of Computing (8 July 2008)

root mode

   Synonym with {wizard mode} or "wheel mode".  Like these, it is
   often generalised to describe privileged states in systems
   other than {operating systems}.

   [{Jargon File}]

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