The Jargon File (version 4.4.7, 29 Dec 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.


The Free On-line Dictionary of Computing (30 December 2018):

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]