R.A.C. Royal Arch Chapter.
RAD. Radical.
RAD., _radix_=Root.
R.A.M. Royal Academy of Music.
R.A.S. Royal Asiatic Society.
R.C. Right centre.
R.C. Roman Catholic; Red Cross.
R.C.M. Royal College of Music.
R.C.P. Royal College of Preceptors.
R.C.S. Royal College of Surgeons.
R.D. Rural Dean; Royal Dragoons.
R.E. Royal Engineers.
REC. Recipe.
RECD. Received.
RECPT. Receipt.
RECT. Rector; Rectory.
REF. CH. Reformed Church.
REG. PROF. Regius Professor.
REGT. Regiment.
REP. Representative; Republic; Report, Reporter.
REPT. Receipt.
RETD. Returned.
REV. Revise, Revision; Revelation.
REV., REVD. Reverend;--REVS., Reverends.
REV. VER. Revised Version.
R.G.G. Royal Grenadier Guards.
R.G.S. Royal Geographical Society.
R.H. Right hand.
R.H. Royal Highness; Royal Highlanders.
R.H.A. Royal Horse Artillery; Royal Hibernian Academy.
RHET. Rhetoric.
R.H.G. Royal Horse Guards.
R.H.S. Royal Humane Society; Royal Horticultural Society; Royal Historical Society.
R.I. Rhode Island.
R.I.B.A. Royal Institute of British Architects.
R.I.P., _requiescat in pace_=May he (or she) rest in peace.
R.M. Royal Mail; Royal Marines.
R.M.A. Royal Military Asylum; Royal Marine Artillery.
R.M.L.I. Royal Marine Light Infantry.
R.M.S. Royal Mail Steamer; Royal Microscopical Society.
R.N. Royal Navy.
R.N.R. Royal Naval Reserve.
ROB., ROBT. Robert.
ROFFEN. Of Rochester.
ROM. Romans.
ROM. CATH. Roman Catholic.
R.P. Reformed Presbyterian; Regius Professor.
R.R. Right Reverend.
R.R.C. Royal Red Cross (for ladies).
R.S. Royal Society.