Abbreviations and Letter Symbols
245
- Pet.—Peters (U.S. Supreme Court Reports)
- Ph—phenyl
- Phar.D.—doctor of pharmacy
- Ph.B. or B.Ph.—bachelor of philosophy
- Ph.D. or D.Ph.—doctor of philosophy
- Ph.G.—graduate in pharmacy
- PHS—Public Health Service
- PIN—personal identification number
- PL—place
- p.m.—(post meridiem) after noon
- P.O. Box (with number)—but post office box (in general sense)
- POP—Point of Presence; Post Office Protocol
- POW—prisoner of war (plural POWs)
- PTSD—post-traumatic- stress disorder
- Private Res. (with number)—private resolution
- Prof.—professor
- pro tem—(pro tempore) temporarily
- P.S.—(post scriptum) postscript; public school (with number)
- PTA—parent-teachers' association
- Public Res. (with number)—public resolution
- PX—post exchange
- QT—on the quiet
- racon—radar beacon
- radar—radio detection and ranging
- R&D—research and development
- rato—rocket-assisted takeoff
- Rd.—road
- RDT&E—research, development, testing, and evaluation
- REA—Rural Electrification Administration
- Rev.—reverend
- Rev. Stat.—Revised Statutes
- RF—radiofrequency
- R.F.D.—rural free delivery
- Rh—Rhesus (blood factor)
- RIF—reduction(s) in force; RIFed, RIFing, RIFs
- R.N.—registered nurse
- ROTC—Reserve Officers' Training Corps
- RR.—railroad
- RRB—Railroad Retirement Board
- Rt. Rev.—right reverend
- Ry—railway
- S.—south; Senate bill (with number)
- SAC—Strategic Air Command
- SAE—Society of Automotive Engineers
- S&L(s)—savings and loan(s)
- SALT—strategic arms limitation talks
- SAR—Sons of the American Revolution
- SBA—Small Business Administration
- sc.—(scilicet) namely (see also ss)
- s.c.—small caps
- S. Con. Res. (with number)—Senate concurrent resolution
- s.d.—(sine die) without date
- SDI—Strategic Defense Initiative
- S. Doc. (with number)—Senate document
- SE.—southeast
- SEATO—Southeast Asia Treaty Organization
- SEC—Securities and Exchange Commission
- sec—secant
- sech—hyperbolic secant
- 2d—second
- SHF—superhigh frequency
- shoran—short range (radio)
