SVID

from The Free On-line Dictionary of Computing (8 July 2008)
System V Interface Definition
SVID

   (SVID) A standard allowing source code portability between
   different {platforms} running Unix System V.

   (1995-03-28)
from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)
SVID
       System V Interface Definition (Unix, AT&T, SCD)
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