V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SU
       Screening Units


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SU
       Signalling Unit


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SU
       Selectable Unit


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SU
       Switch User (Unix)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

SU
       Storage Unit


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

su

    (substitute user) The
   Unix command which allows you to become another user after
   entering their password.  su is most often used without
   arguments in which case it defaults to user root.  Some
   versions of Unix only allows this command to be used by
   members of the wheel group.

   Unix manual page: su(1).

   (1996-09-08)