WordNet (r) 3.0 (2006):

FCS
    n 1: a cooperative nationwide system of banks and associations
         providing credit to farmers and related businesses;
         originally capitalized by the federal government but now
         owned by its members and borrowers [syn: Farm Credit
         System, FCS]

The Free On-line Dictionary of Computing (19 January 2023):

Frame Check Sequence
FCS

    (FCS) The extra characters added to a frame
   for error detection and correction(?).  FCS is used in
   X.25, HDLC, Frame Relay, and other data link layer
   protocols.

   (1998-02-27)