Fellow of the Royal Society

FRSForMemRSF.R.S.FellowFellows of the Royal SocietyFellowsForeign Member of the Royal SocietyForeign Member of the Royal Society (ForMemRS)F.R.SRoyal Society

Fellowship of the Royal Society (FRS, ForMemRS and HonFRS) is an award granted to individuals that the Royal Society of London judges to have made a 'substantial contribution to the improvement of natural knowledge, including mathematics, engineering science and medical science'.wikipedia