List of acronyms: R

(Main list of acronyms)

R – Reinforcing – Right – Röntgen – Restricted

R0–9

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

RA

Ra – Radium
RA – Radio Australia
RA
* Radio altimeter
* Rain
* Rear Area
* Reinforced Alert
* Republican Army
* Resolution advisory
* Right Ascension
* Royal Academy
* Royal Artillery
RAA
* Royal Automobile Association
* Rear Assembly Area
RAAF – Royal Australian Air Force
Rabobank – Raiffeisen-Boerenleenbank
RAC
* Royal Automobile Club
* Rutgers Athletic Center, an indoor arena at the New Brunswick–Piscataway campus of Rutgers University
RACK – Risk Aware Consensual Kink
Racon – RAdar beaCON
RADA – Royal Academy of Dramatic Art
Radar – Radio Detection And Ranging
RADB
* Real America Database
* Resource Assessment Database
* Reunion Address DataBase
* Rice Allelopathy Data Base
* Routing Arbiter Database
RADb – Routing Assets Data Base
RadB – Rad51/Dmc1 homologous protein
RADC – Region Air Defence Commander
RAE – UK Royal Aircraft Establishment
RAF – Red Army Faction – Royal Air Force
RAG
* Raising and Giving
* Rocket Antitank Grenade
RAGBRAI – Register's Annual Great Bicycle Ride Across Iowa
RAM – Random Access Memory – Rolling Airframe Missile – Royal Air Maroc
Ramark – RAdar MARKer
RAOC – Rear Area Operation Centre
RAP
* Radio Access Point
* Radiological Assistance Program
* Rear Area Protection
* Recognized air picture|Recognised Air Picture
* Recurring Advance Payment
* Relational Associative Processor
* Reliable Acoustic Path
* Rocket-Assisted Projectile
* Rule against perpetuities
RAPIDS – Real-Time Automated Personnel Identification System
RARDE – UK Royal Armament Research and Development Establishment
RARE – Rapid Acquisition with Relaxation Enhancement
RASC – Royal Army Service Corp
RATELO – Radiotelephone Operator

RB

Rb – Rubidium
RB – Running back
R&B – Rhythm and Blues
RBAR – 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 – Radio Based Combat Identification
RBI
* Reserve Bank of India
* Runs batted In
RBOC – Regional Bell Operating Company

RC

RC – see entry
RCA
* Radio Corporation of America
* Root Cause Analysis
* Royal Canadian Artillery
* Royal City Avenue
RCAF – Royal Canadian Air Force
RCAR – Research Council for Automobile Repairs
RCC – Rescue Co-ordination Centre
RCCO – Royal Canadian College of Organists
RCHA – Royal Canadian Horse Artillery
RCMP – Royal Canadian Mounted Police
RCRA – Resource Conservation and Recovery Act
RCS
* Radar Cross-Section
* Reaction Control System
* Revision Control System
RCT
* Randomized Controlled Trial
* Robotically Controlled Telescope
* Rugby club toulonnais
RCZ – Rear Combat Zone

RD

R&D – Research & Development
RD – Radio Disney
RDA
* Research, Development, and Acquisition
* Recommended Daily Allowance
RDD – Radiological Dispersion Device
RDDL – Resource Directory Description Language
RDECOM – Research, Development and Engineering Command
RDM – Remotely Delivered/Deliverable Mine
RDO
* Rapid, Decisive Operation
* Regular Day Off
* Remote Data Objects
RDS
* Amazon Relational Database Service
* Remote Desktop Services
* Réseau des sports
* Respiratory distress syndrome
* Royal Dublin Society
RDT – Remote Digital Terminal
RDTE or RDT&E – Research, Development, Test, and Evaluation
RDV – Remote Detection Vehicle

RE

Re – Rhenium
RE – Requirements Engineering
RE – Royal Engineers
REACH – Registration, Evaluation, Authorisation and Restriction of Chemicals
REACT – Remote Electronically Activated Control Technology
REAM – Retired Educators Association of Minnesota
RECCE – Reconnaissance
REEF – Reef Environmental Education Foundation
REM – Rapid Eye Movement (sleep phase) – Rosicrucian Egyptian Museum
REME – Royal Electrical and Mechanical Engineers
RERC –
RES – Radiation Exposure Status – Reserve
RESNA –
REU – Réunion

RF

Rf – Rutherfordium
RF – Radio Frequency – Receptive Field
RFA – Restrictive Fire Area – Royal Field Artillery
RFC – Request for Comments – Royal Flying Corps
RFD – Request for Documentation
RFE – Request for Evaluation
RFEF – Real Federación Española de Fútbol
RFF – Right of First Refusal
RFI – Ready For Inspection – Ready For Issue – Request For Information – Radio Frequency Interference
RFID – Radio Frequency IDentification
RFL – Rugby Football League
RFL – Restrictive Fire Line
RFP – Request for Proposal
RFQ – Request for Quotation
RFT – Request for Tender
RFU – Rugby Football Union

RG

Rg – Roentgenium
RG – Republican Guard
RGB – Red Green Blue
RGBI – Red Green Blue Intensity

RH

Rh – Rhodium
RH – Southern Rhodesia
RHIC – Relativistic Heavy Ion Collider
RHLI – Royal Hamilton Light Infantry
RHO – Southern Rhodesia
RHS – Right Hand Side – Redland High School – Royal Horticultural Society – London
RHU – Replacement Holding Unit
RHWR – Radar Homing and Warning Receiver

RI

RI – Rex et Imperator, Regina et Imperatrix King-Emperor
RI – Rhode Island
RIAA – Recording Industry Association of America
RIBA – Royal Institute of British Architects
RIF
* Reduction In Force
* Resistance Index for Frostbite
* Reading Is Fundamental
RIFA – Red imported fire ant
RILA – Retail Industry Leaders Association
RIM
* Remote integrated multiplexer, Australian term for a digital loop carrier
* Research In Motion, former name of the BlackBerry company
* Revolutionary Internationalist Movement
* Royal Indian Marine, former navy of British colonial India
RIMVS – Retinal Imaging Machine Vision System
RINO – Republican In Name Only
RIP
* Relief In Place
* RIP|requiescat in pace
RIS
* Range Instrumentation System
* Réseau Info Sports
RISC – Reduced Instruction Set Computer
RISD – Rhode Island School of Design
RISTA – Reconnaissance, Intelligence, Surveillance, and Target Acquisition
RWH – Rain Water Harvesting

RJ

RJD – Reduced Julian Day

RK

RKBA – Right to Keep and Bear Arms
RKI – Robert Koch Institute, German governmental research institute in Berlin
RKO – Radio-Keith-Orpheum Pictures

RL

rL – Rontolitre
RL – Release Line – Real Life – Ronnalitre
RLP – Recognised Land Picture
RLS – Restless Leg Syndrome
RLY – Rally Point

RM

RM – see separate disambiguation page
rm – Raeto-Romansh language
RMA – Return Mailing Authorization – Revolution in Military Affairs – Rachel McAdams
RMC –
RMC – Royal Military College
RMDA – Records Management and Declassification Agency
RMP – Recognised Maritime Picture
RMS – Rate-Monotonic Scheduling – Richard M. Stallman – Root-Mean-Square – Royal Mail Ship

RN

rn – Rundi language
Rn – Radon
RN
* Radio Netherlands
* Registered Nurse
* Royal Navy
* right now, in text messages, direct messages, and emails
RNA – RiboNucleic Acid
RNAD – Royal Naval Armaments Depot
RNPS – Radio Network Planning System
RNZ – Radio New Zealand
RNZI – Radio New Zealand International

RO

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

RP

RP
* Philippines
* Release Point
* Reporting Party
* Role-Playing
RPA – Regional Plan Association
RPD – Recognition-Primed Decision-making
RPF – Rwandan Patriotic Front
RPG
* Regional Planning Group
* Report Program Generator
* Rocket Projectile Gun
* Rocket-Propelled Grenade
* Role-Playing Game
RPI
* Rating percentage index, a metric used in the selection of teams for many NCAA college sports tournaments
* Rensselaer Polytechnic Institute
* Retail price index, measure of inflation in the UK
RPL – Reverse Polish Lisp
rpm – revolutions per minute
RPM
* Rebated Precision Magnum, a family of rifle cartridges manufactured by Weatherby
* Records, Promotion, Music
* Red Hat Package Manager
RPN – reverse Polish notation
RPO
* Radiation Protection Officer
* Regular Production Option
* Run-pass option, an offensive scheme in American football
RPR FOM – Realtime Platform Reference Federation Object Model
rps – revolutions per second
RPV – Remotely Piloted Vehicle

RQ

RQ – Puerto Rico

RR

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

RS

RS – Russia
R&S – Reconnaissance & surveillance
R/S – Respectfully submitted
RSA
* Regimental support area
* Republic of South Africa
* Rivest–Shamir–Adleman encryption
* South Africa
RSD
* Reflex sympathetic dystrophy
* Serbian dinar
RSEQ – Réseau du sport étudiant du Québec
RSI – Repetitive strain injury
RSJ – Rolled steel joist
RSN – Real soon now
RSPB – Royal Society for the Protection of Birds
RSPCA – Royal Society for the Prevention of Cruelty to Animals
RSR – Required supply rate
RSRE – UK Royal Signals and Radar Establishment
– Red Sands Research Institute
RSS – Really simple syndication
RSTA – Reconnaissance, surveillance, and target acquisition
RSVP – ''répondez s'il vous plaît''

RT

RT
* Real time
* Radio telephone
* Respiratory therapist
* Return to duty
RTA – Road traffic accident
RTBF – Radio-Télévision belge de la Communauté française
RTCA – RTCA, Inc.
RTÉ – Raidió Teilifís Éireann
RTF – Rich Text Format
RTFM – Read the fucking/fine manual
RTG
* Radio-isotope thermoelectric generator
* Rubber tyred gantry crane
RTGS
* Royal Thai General System of Transcription
* Real-time gross settlement
RTI – Run-time infrastructure
RTL – see entry
RTLM – Radio Télévision Libre des Mille Collines, Rwandan radio station notorious for its role in the Rwandan genocide
RTLS – 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 – Real Time Production Optimization – Reservoir Management
RTP – Real-time Transport Protocol
RT-PCR – reverse transcriptase polymerase chain reaction. Clarified with "quantitative PCR" or "reverse transcriptase PCR" where appropriate.
RTS – see entry
RTT – Round Trip Timing
RTV – Rapid Terrain Visualization ACTD – Retro Television Network

RU

ru – Russian language
Ru – Ruthenium
RU – Russia
RUB – Russian ruble
RuBisCO – Ribulose-1,5-bisphosphate carboxylase/oxygenase
RUC – Royal Ulster Constabulary
run – Rundi language
rus – Russian language
RUS – Russia
RUSI – Royal United Services Institute for Defence Studies

RV

RW

rw – Rwanda language
RW – Rwanda
RWA – Rwanda
RWADA – Resident Weighted Average Daily Attendance
RWF – Rwandan franc
RWR – Radar Warning Receiver
RWS – Remote Weapon Station

RX

Rx – Medical prescription
RX – Receive