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

USENIX

    Since 1975, the USENIX Association has provided a forum
   for the communication of the results of innovation and
   research in Unix and modern open systems.  It is well
   known for its technical conferences, tutorial programs, and
   the wide variety of publications it has sponsored over the
   years.

   USENIX is the original not-for-profit membership organisation
   for individuals and institutions interested in Unix and
   Unix-like systems, by extension, X, object-oriented
   technology, and other advanced tools and technologies, and the
   broad interconnected and interoperable computing environment.

   USENIX's activities include an annual technical conference;
   frequent specific-topic conferences and symposia; a highly
   regarded tutorial program covering a wide range of topics,
   introductory through advanced; numerous publications,
   including a book series, in cooperation with The MIT Press,
   on advanced computing systems, proceedings from USENIX
   symposia and conferences, the quarterly journal "Computing
   Systems", and the biweekly newsletter; "login: ";
   participation in various ANSI, IEEE and ISO standards
   efforts; sponsorship of local and special technical groups
   relevant to Unix.  The chartering of SAGE, the System
   Administrators Guild as a Special Technical Group within
   USENIX is the most recent.

   (http://usenix.org).

   Usenet newsgroup: news:comp.org.usenix.

   (1994-12-07)