Wikipedia
DFBCS is an abbreviation for Distinguished Fellow of the British Computer Society (BCS).
From time to time, BCS considers the award of a Distinguished Fellowship to members of the computing profession who have made an outstanding contribution to the advancement of computing.
The Distinguished Fellowship of BCS is awarded under bylaw 7 of the BCS's Royal Charter. Trustee Board Regulation 1.2 specifies that the award may be made even if the individual in question is not already a member of BCS and may not be eligible for any other class of membership.
The award was first approved in 1969 and the first election was made in 1971 to Edsger W. Dijkstra. The nominations committee is responsible for identifying and proposing suitable candidates. The actual election of such members of the profession is made by a resolution of the trustee board on the recommendation of the president.