bnc

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

BNC

   <hardware> A connector for {coaxial cable} such as that used
   for some video connections and {RG58} "{cheapernet}"
   connections.  A BNC connector has a bayonet-type shell with
   two small knobs on the female connector which lock into spiral
   slots in the male connector when it is twisted on.

   Different sources expand BNC as Bayonet Navy Connector,
   British Naval Connector, Bayonet Neill Concelman, or Bayonet
   Nut Connection.

   (1995-09-18)

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

BNC
       Baby N Connector (slang)

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

BNC
       Bayonet Neill Concelman [connector]

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

BNC
       Bayonet Nut Coupling

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

BNC
       Bayonet Nipple Connector (slang)

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

BNC
       British National Connector

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

BNC
       British Naval Connector