ARCnet

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

ARCnet

   <networking> A {network} developed by {DataPoint}.  ARCnet was
   {proprietary} until the late 1980s and had about as large a
   marketshare as {Ethernet} among small businesses.  It was
   almost as fast and was considerably cheaper at the time.

   (1995-01-16)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

ARCNET
       Attached Resource Computer NETwork (Datapoint), "ARCnet"