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
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
- RV
- * Reconnaissance Vehicle
- * Recreational Vehicle
- * Re-entry Vehicle
- * reciprocation void
- RVD
- * Rijksvoorlichtingsdienst
- * Rob Van Dam
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