ac3

from The Free On-line Dictionary of Computing (8 July 2008)
AC3

   <audio> An {audio} format by Sony[?], the successor of {AC2}.
   AC3 is used for multi-channel {audio} for {digital video}.

   (2001-12-18)
from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)
AC3
       [digital] Audio Compression - 3 (Dolby, DVD, Digital audio),
"AC-3"
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