PRES., PRESES. President.
P.R.I.B.A. President of the Royal Institute of British Architects.
P.R.N., _pro re nata_=For special business arising.
PRO TEM., _pro tempore_=For the time being.
P.R.S. President of the Royal Society.
P.R.S.A. President of the Royal Scottish Academy.
P.R.S.E. President of the Royal Society of Edinburgh.
P.S., _post scriptum_=Postscript, written after.
PS., PSA. Psalms.
P.T. Pupil Teacher.
P.T.O. Please turn over.
PUB. DOC. Public Document.
P.W.D. Public Works Department.
P. & O. Peninsular and Oriental Company.
Q., _quadrans_=Farthing; Query; Quintal.
Q., QU. Query; Question.
Q.A.B. Queen Anne's Bounty.
Q.B. Queen's Bench.
Q.C. Queen's Counsel; Queen's College.
Q.D., _quasi dicat_=As if he should say.
Q.E., _quod est_=Which is.
Q.E.D., _quod erat demonstrandum_=Which was to be demonstrated.
Q.E.F., _quod erat faciendum_=Which was to be done.
Q.E.I, _quod erat inveniendum_=Which was to be found out.
Q.L., _quantum libet_=As much as you please.
QM., _quomodo_=In what manner; How.
Q.S., Quantum suff., _quantum sufficit_=A sufficient quantity.
QT. Quantity; Quart;--QTS., Quarts.
QU. Queen; Question,
QU., QUAR. Quart, Quarter, Quarterly,
Q.V., _quod vide_=Which see; _quantum vis_=As much as you will.
R., _rex, regina_=King, Queen.
R., REAU. Reaumur's thermometric scale.
R.A. Royal Academy or Academician; Royal Artillery.