• Source: List of acronyms: R

This list contains acronyms, initialisms, and pseudo-blends that begin with the letter R.
For the purposes of this list:

acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars
initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
(a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome
(i) = initialism, e.g.: CD – (i) compact disc
(p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women
(s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – megahertz)
Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P.
(Main list of acronyms)

R – (i) Reinforcing – Right – (s) Röntgen – (i) Restricted (movie rating)




R0–9


R@R-(I) Respond as Receipt
R0–99 – (i) R-value (insulation)
R2I – (i) Resistance to Interrogation
R3P – (i) Rearm, Refuel, and Resupply Point




RA


Ra – (s) Radium
RA – (a) Radio Australia
RA
(i) Radio altimeter
(s) Rain (METAR Code)
(i) Rear Area
Reinforced Alert
Republican Army
(i) Resolution advisory
Right Ascension
Royal Academy
Royal Artillery (UK)
RAA
(a) Royal Automobile Association
(i) Rear Assembly Area
RAAF – (i) Royal Australian Air Force
Rabobank – (p) Raiffeisen-Boerenleenbank (from the two banks that merged to form the modern company)
RAC
(i) Royal Automobile Club (in the United Kingdom, renamed RAC plc in 2002)
Rutgers Athletic Center, an indoor arena at the New Brunswick–Piscataway campus of Rutgers University
RACK – (a) Risk Aware Consensual Kink (SM phrase)
Racon – (p) RAdar beaCON
RADA – (a) Royal Academy of Dramatic Art
Radar – (p) Radio Detection And Ranging
RADB
(i) Real America Database
Resource Assessment Database
Reunion Address DataBase
Rice Allelopathy Data Base
Routing Arbiter Database
RADb – (i) Routing Assets Data Base
RadB – (s) Rad51/Dmc1 homologous protein
RADC – (i) Region Air Defence Commander
RAE – (i) UK Royal Aircraft Establishment (−1991)
RAF – (i) Red Army Faction – Royal Air Force
RAG
(a) Raising and Giving
Rocket Antitank Grenade
RAGBRAI – (a) Register's Annual Great Bicycle Ride Across Iowa
RAM – (a) Random Access Memory – Rolling Airframe Missile – Royal Air Maroc
Ramark – (p) RAdar MARKer
RAOC – (i) Rear Area Operation Centre
RAP
(a/i) Radio Access Point
Radiological Assistance Program (U.S. Department of Energy)
Rear Area Protection
Recognised [Operating/Operational] Air Picture
Recurring Advance Payment
Relational Associative Processor
Reliable Acoustic Path
Rocket-Assisted Projectile
Rule against perpetuities
RAPIDS – (a) Real-Time Automated Personnel Identification System (US Department of Defense personnel authentication system)
RARDE – (a) UK Royal Armament Research and Development Establishment (1962–1991)
RARE – (a) Rapid Acquisition with Relaxation Enhancement (MRI technique)
RASC – (a) Royal Army Service Corp (former corps of British Army)
RATELO – (p) Radiotelephone Operator




RB


Rb – (s) Rubidium
RB – (i) Running back (football)
R&B – (i) Rhythm and Blues
RBAR – (i) Row by agonizing row – a derogatory way of describing a technique of scanning a set of records in a database to update or examine the contents of each one. This is the technique of last resort in most cases, since most database operations are optimized when using set based analysis instead of the RBAR method.
RBCI – (i) Radio Based Combat Identification
RBI
(i) Reserve Bank of India
(i) Runs batted In
RBOC – (a/i) Regional Bell Operating Company ("Baby Bell")




RC


RC – see entry
RCA
(i) Radio Corporation of America
Root Cause Analysis
Royal Canadian Artillery
Royal City Avenue (famous entertainment zone in Thailand)
RCAF – (i) Royal Canadian Air Force
RCAR – (a) Research Council for Automobile Repairs ("are-car")
RCC – (i) Rescue Co-ordination Centre
RCCO – (i) Royal Canadian College of Organists
RCHA – (i) Royal Canadian Horse Artillery (regiment)
RCMP – (i) Royal Canadian Mounted Police
RCRA – (a) Resource Conservation and Recovery Act ("reck-ra" or "rick-ra")
RCS
(i) Radar Cross-Section
Reaction Control System
Revision Control System
RCT
(i) Randomized Controlled Trial
Robotically Controlled Telescope
Rugby club toulonnais (French, "Toulon Rugby Club")
RCZ – (i) Rear Combat Zone




RD


R&D – (i) Research & Development
RD – Radio Disney
RDA
(i) Research, Development, and Acquisition
Recommended Daily Allowance (Nutrition)
RDD – (i) Radiological Dispersion Device
RDDL – (a/i) Resource Directory Description Language ("riddle")
RDECOM – (p) (U.S. Army) Research, Development and Engineering Command
RDM – (i) Remotely Delivered/Deliverable Mine
RDO
(i) Rapid, Decisive Operation(s)
Regular Day Off
Remote Data Objects
RDS
(i) Amazon Relational Database Service
(i) Remote Desktop Services (Microsoft service)
(i) Réseau des sports (French, "Sports Network" — Canadian French-language TV channel)
(i) Respiratory distress syndrome
(i) Royal Dublin Society (see also RDS Arena, a stadium on the grounds often called "the RDS")
RDT – (i) Remote Digital Terminal
RDTE or RDT&E – (i) Research, Development, Test, and Evaluation
RDV – (i) Remote Detection Vehicle




RE


Re – (s) Rhenium
RE – (i) Requirements Engineering
RE – (s) Royal Engineers
REACH – (p) Registration, Evaluation, Authorisation and Restriction of Chemicals
REACT – (a) Remote Electronically Activated Control Technology
REAM – (a) Retired Educators Association of Minnesota
RECCE – (a) Reconnaissance
REEF – (a) Reef Environmental Education Foundation
REM – (i/a) Rapid Eye Movement (sleep phase) – Rosicrucian Egyptian Museum
REME – (a) Royal Electrical and Mechanical Engineers
RERC – (i) Rehabilitation Engineering Research Center
RES – (i) Radiation Exposure Status – (p) Reserve
RESNA – (a) Rehabilitation Engineering and Assistive Technology Society of North America
REU – (s) Réunion (ISO 3166 trigram)




RF


Rf – (s) Rutherfordium
RF – (i) Radio Frequency – Receptive Field (neurophysiology)
RFA – (i) Restrictive Fire Area (military) – Royal Field Artillery
RFC – (i) Request for Comments – Royal Flying Corps (WWI precursor to RAF)
RFD – (a) Request for Documentation
RFE – (i) Request for Evaluation
RFEF – (i) Real Federación Española de Fútbol (Spanish for Royal Spanish Football Federation)
RFF – (i) Right of First Refusal (legal term)
RFI – (i) Ready For Inspection – Ready For Issue – Request For Information – Radio Frequency Interference
RFID – (p) Radio Frequency IDentification
RFL – (i) Rugby Football League
RFL – (i) Restrictive Fire Line (military)
RFP – (a) Request for Proposal
RFQ – (a) Request for Quotation
RFT – (a) Request for Tender
RFU – (i) Rugby Football Union




RG


Rg – (s) Roentgenium
RG – (i) Republican Guard
RGB – (i) Red Green Blue (colour model)
RGBI – (i) Red Green Blue Intensity (ditto)




RH


Rh – (s) Rhodium
RH – (s) Southern Rhodesia (ISO 3166 digram; obsolete 1980)
RHIC – (i) Relativistic Heavy Ion Collider
RHLI – (i) Royal Hamilton Light Infantry (Canadian militia regiment)
RHO – (s) Southern Rhodesia (ISO 3166 trigram; obsolete 1980)
RHS – (i) Right Hand Side – Redland High School – (a) Royal Horticultural Society – London
RHU – (i) Replacement Holding Unit
RHWR – (i) Radar Homing and Warning Receiver ("raw" for short)




RI


RI – (s) Rex et Imperator, Regina et Imperatrix King-Emperor
RI – (s) Rhode Island (postal symbol)
RIAA – (i) Recording Industry Association of America
RIBA – (a) Royal Institute of British Architects
RIF
(i) Reduction In Force (layoffs)
Resistance Index for Frostbite
Reading Is Fundamental
RIFA – (a) Red imported fire ant
RILA – (a) Retail Industry Leaders Association
RIM
(a) Remote integrated multiplexer, Australian term for a digital loop carrier
Research In Motion, former name of the BlackBerry company
Revolutionary Internationalist Movement (Maoist organization)
Royal Indian Marine, former navy of British colonial India
RIMVS – (i) Retinal Imaging Machine Vision System
RINO – (a) Republican In Name Only
RIP
(a/i) Relief In Place
(i) requiesca[n]t in pace (Latin for "may he/she/they rest in peace")
RIS
(i) Range Instrumentation System
Réseau Info Sports (French, roughly "Sports News Network" — Canadian French-language TV channel)
RISC – (i) Reduced Instruction Set Computer
RISD – (p) Rhode Island School of Design ("riz-dee")
RISTA – (a) Reconnaissance, Intelligence, Surveillance, and Target Acquisition (see also ISTAR)
RWH – (a) Rain Water Harvesting




RJ


RJD – (i) Reduced Julian Day




RK


RKBA – Right to Keep and Bear Arms (Second Amendment to the United States Constitution)
RKI – (i) Robert Koch Institute, German governmental research institute in Berlin
RKO – (i) Radio-Keith-Orpheum Pictures




RL


rL – (i) Rontolitre
RL – (i) Release Line – Real Life – Ronnalitre
RLP – (i) Recognised [Operating/Operational] Land Picture
RLS – (i) Restless Leg Syndrome
RLY – (p) Rally Point




RM


RM – see separate disambiguation page
rm – (s) Raeto-Romansh language (ISO 639-1 code)
RMA – (i) Return Mailing Authorization – Revolution in Military Affairs – Rachel McAdams
RMC – (i) Robert Menzies College
RMC – (ii) Royal Military College (Australia, Canada, UK)
RMDA – (i) Records Management and Declassification Agency
RMP – (i) Recognised [Operating/Operational] Maritime Picture
RMS – (i) Rate-Monotonic Scheduling – Richard M. Stallman – Root-Mean-Square – Royal Mail Ship (e.g. RMS Titanic)




RN


rn – (s) Rundi language (Kirundi) (ISO 639-1 code)
Rn – (s) Radon
RN
(a) Radio Netherlands
(i) Registered Nurse (US)
(i) Royal Navy
right now, in text messages, direct messages, and emails
RNA – (i) RiboNucleic Acid
RNAD – Royal Naval Armaments Depot (UK)
RNPS – (i) Radio Network Planning System
RNZ – (a) Radio New Zealand
RNZI – (a) Radio New Zealand International




RO


ro – (s) Romanian language (ISO 639-1 code)
RO – (i) Range Only – Red Orchestra – (s) Romania (ISO 3166 and FIPS 10-4 country code digram)
ROA – (a/i) Rate Of Ascent
ROC – (i/a) Receiver Operating Characteristic (statistics) – Regional Operations Centre – Republic Of China – Roc-A-Fella Records – Regional Organisations of Councils
ROCV or ROC-V – (i) Recognition Of Combat Vehicles ("rock-vee")
ROD – (a/i) Rate Of Descent – Record Of Decisions – Report Of Discrepancy
ROE – (i) Rules Of Engagement
roh – (s) Raeto-Romansh language (ISO 639-2 code)
ROH – (i) Ring of Honor
ROI – (i) Return On Investment, Republic of Ireland.
ROME – (a) Return On Modeling Effort
ROFL(MAO) – (i) Rolling On the Floor Laughing (My Ass Off)
ROFLOL – (i) Rolling On the Floor Laughing Out Loud
ROK – (a/i) Republic of Korea
ROL – (s) Romanian leu (ISO 4217 currency code)
ROM – (a) Read-Only Memory – Refuel On the Move – Royal Ontario Museum
ron – (s) Romanian language (ISO 639-2 code)
RON – (s) Romanian new leu (ISO 4217 currency code)
ROP – (i) Render Output Pipeline
ROPE – Research Opportunity and Performance Evidence
RORO OR ro-ro – (a) Roll-On/Roll-Off (ferry)
ROS – (i) Reactive Oxygen Species
ROTC – (i) Reserve Officer Training Corps ("Rawt-Cee")
ROU – (s) Romania (ISO 3166 trigram)
ROV – (i) Remotely Operated Vehicle
ROW – (i) Right Of Way – Rest Of the World
ROWPU – (a) Reverse Osmosis Water Purification Unit ("roe-pew")
ROY G BIV – colors of the prism; Red, Orange, Yellow, Green, Blue, Indigo, Violet
ROZ – (a/i) Restricted Operations Zone




RP


RP
(s) Philippines (FIPS 10-4 country code)
(i) Release Point
(i) Reporting Party (Law Enforcement)
Role-Playing [relationship potential]
RPA – (i) Regional Plan Association
RPD – (i) Recognition-Primed Decision-making
RPF – (i) Rwandan Patriotic Front
RPG
(i) (US-CA) Regional Planning Group
Report Program Generator
Rocket Projectile Gun
Rocket-Propelled Grenade
Role-Playing Game
RPI
(i) Rating percentage index, a metric used in the selection of teams for many (U.S.) NCAA college sports tournaments
Rensselaer Polytechnic Institute
Retail price index, measure of inflation in the UK
RPL – (i) Reverse Polish Lisp
rpm – (s) revolutions per minute
RPM
(i) Rebated Precision Magnum, a family of rifle cartridges manufactured by Weatherby
Records, Promotion, Music (expansion of the title of a former Canadian music magazine)
Red Hat Package Manager
RPN – (i) reverse Polish notation
RPO
(i) Radiation Protection Officer
Regular Production Option
Run-pass option, an offensive scheme in American football
RPR FOM – (i/a) Realtime Platform Reference Federation Object Model ("reaper fomm")
rps – (s) revolutions per second
RPV – (i) Remotely Piloted Vehicle




RQ


RQ – (s) Puerto Rico (FIPS 10-4 territory code)




RR


R&R – (i) Rest & relaxation
RRB – (i) Railroad Retirement Board
RRN – (i) Recurrence rate number
RRP – (i) Recurrent respiratory papillomatosis
RRS – (i) Racing Rules of Sailing
RRSP – (i) Registered retirement savings plan




RS


RS – (s) Russia (FIPS 10-4 country code)
R&S – (i) Reconnaissance & surveillance
R/S – (i) Respectfully submitted
RSA
(i) Regimental support area
Republic of South Africa
Rivest–Shamir–Adleman encryption
(s) South Africa (IOC and FIFA trigram, but not ISO 3166)
RSD
(i) Reflex sympathetic dystrophy
(s) Serbian dinar (ISO 4217 currency code)
RSEQ – (i) Réseau du sport étudiant du Québec (French, "Quebec Student Sports Network")
RSI – (i) Repetitive strain injury
RSJ – (i) Rolled steel joist (construction)
RSN – (i) Real soon now (coined by author Jerry Pournelle)
RSPB – (i) (UK) Royal Society for the Protection of Birds
RSPCA – (i) Royal Society for the Prevention of Cruelty to Animals
RSR – (i) Required supply rate
RSRE – (i) UK Royal Signals and Radar Establishment (1976–1991)
RSRI – (i) Red Sands Research Institute
RSS – (i) Really simple syndication
RSTA – (i) Reconnaissance, surveillance, and target acquisition
RSVP – (i) répondez s'il vous plaît (French for "respond if you please")




RT


RT
(i) Real time
Radio telephone
Respiratory therapist
(p) Return to duty
RTA – (i) Road traffic accident (British)
RTBF – (i) Radio-Télévision belge de la Communauté française (French, "Belgian Radio-Television of the French-speaking Community")
RTCA – (i) RTCA, Inc.
RTÉ – (i) Raidió Teilifís Éireann
RTF – (i) Rich Text Format
RTFM – (i) Read the fucking/fine manual
RTG
(i) Radio-isotope thermoelectric generator
Rubber tyred gantry crane
RTGS
(a) Royal Thai General System of Transcription
Real-time gross settlement
RTI – (i) Run-time infrastructure (simulation)
RTL – see entry
RTLM – Radio Télévision Libre des Mille Collines (French, "Free Radio and Television of the Thousand Hills"), Rwandan radio station notorious for its role in the Rwandan genocide
RTLS – (a) Return to launch site – period in NASA Space Shuttle ascent profile where, during ascent, shuttle aborts ascent and turns and glides back to landing strip at launch site
RTPO-RM – (i) Real Time Production Optimization – Reservoir Management
RTP – (i) Real-time Transport Protocol
RT-PCR – (i) reverse transcriptase polymerase chain reaction (sometimes real-time polymerase chain reaction). Clarified with "quantitative PCR" ("qPCR") or "reverse transcriptase PCR" where appropriate.
RTS – see entry
RTT – (i) Round Trip Timing
RTV – (i) Rapid Terrain Visualization ACTD – Retro Television Network




RU


ru – (s) Russian language (ISO 639-1 code)
Ru – (s) Ruthenium
RU – (s) Russia (ISO 3166 digram)
RUB – (s) Russian ruble (ISO 4217 currency code)
RuBisCO – (p) Ribulose-1,5-bisphosphate carboxylase/oxygenase (enzyme involved in carbon fixation)
RUC – (i) Royal Ulster Constabulary
run – (s) Rundi language (Kirundi) (ISO 639-2 code)
rus – (s) Russian language (ISO 639-2 code)
RUS – (s) Russia (ISO 3166 trigram)
RUSI – (p) Royal United Services Institute for Defence Studies




RV


RV
(i) Reconnaissance Vehicle
Recreational Vehicle
Re-entry Vehicle
reciprocation void
RVD
(p) Rijksvoorlichtingsdienst (Dutch, "Government Information Service")
(i) Rob Van Dam (American professional wrestler)




RW


rw – (s) Rwanda language (Kinyarwanda) (ISO 639-1 code)
RW – (s) Rwanda (ISO 3166 and FIPS 10-4 country code digram)
RWA – (s) Rwanda (ISO 3166 trigram)
RWADA – (a) Resident Weighted Average Daily Attendance (New York State term used in public education to indicate the size of a school district, i.e. its number of students)
RWF – (s) Rwandan franc (ISO 4217 currency code)
RWR – (i) Radar Warning Receiver
RWS – (i) Remote Weapon Station




RX


Rx – (s) Medical prescription (possibly from Latin "recipere", "to take": see entry)
RX – (s) Receive




Notes and references

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• List of acronyms: R
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• List of acronyms: A
• Glossary of military abbreviations
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