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

USR
       User Service Routines


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

USR
       U.S. Robotics (manufacturer)


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

usr

   User.  The "/usr" directory hierarchy on Unix systems.  Once
   upon a time, in the early days of Unix, this area actually
   held users' home directories and files.  Since these tend to
   expand much faster than system files, /usr would be mounted on
   the biggest disk on the system.  The root directory, "/" in
   contrast, contains only what is needed to boot the kernel,
   after which /usr and other disks could be mounted as part of
   the multi-user start-up process.

   /usr has been used as the "everything else" area, with many
   "system" files such as compiler libraries (/usr/include,
   /usr/lib), utilty programs (/usr/bin, /usr/ucb), games
   (/usr/games), local additions (/usr/local), manuals
   (/usr/man), temporary files and queues for various daemons
   (/usr/spool).  These optional extras have grown in size as
   Unix has evolved and disks have dropped in price.  Under later
   versions of SunOS, the user files have fled /usr altogether
   for a new "/home" partition and temporary files have moved
   to "/var".  This allows /usr to be mounted read-only with some
   gain in security and performance since access times are not
   updated for files on read-only file systems.


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

U.S. Robotics, Inc.
USR
US Robotics

    A US modem manufacturer.

   (http://usr.com/).

   (ftp://ftp.usr.com/).

   Finger: usr.com.

   E-mail: ,  (USA and Canada),
   ,  (Europe),
    (other).

   (1995-03-14)