Source : Free On-Line Dictionary of Computing

MPEG-2 audio layer 3
     
         An extention
        of {MPEG-1 audio layer 3} for lower sampling rates (16-24 kHz)
        targeting bit rates from 32-64 kbps (possibly 8-160 kbps).  It
        is often combined with {MPEG-2 LSF}.
     
        (2001-12-04)