V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

VRC
       Vertical Redundancy Check


The Free On-line Dictionary of Computing (30 December 2018):

Vertical Redundancy Check
VRC

    (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 XORing 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)