VRC

from The Free On-line Dictionary of Computing (8 July 2008)
Vertical Redundancy Check
VRC

   <storage, communications> (VRC) An {error checking} method
   performed on one 8-bit {ASCII} character, where the 8th bit is
   used as the {parity bit}.

   The resulting parity bit is constructed by {XOR}ing the
   {word}.  The result is a "1" if there is an odd number of 1s,
   and a "0" if there is an even number of 1s in the word.  This
   method is unreliable because if an odd number of {bits} are
   distorted, the check will not detect the error.  The
   {Longitudinal Redundancy Check} is an improvement.

   (2001-04-28)