| CODE | ABBREVIATION |
| R | Reminde/ Ring |
| R&R | Rate & Route |
| R&SE | Research & Systems Engineering |
| R-) | Broken Glasses |
| R/O | Read/Only |
| R/W | Read Write |
| R/WM | Read/Write Memory |
| RA | Rate Adapter (0 1 2) / Read Audit / Recognition Arrangement / Registration Authority |
| RAB | RAID Advisory Board |
| RABID | Rebellion Against Big Irrepressible Dweebs |
| RACE | Research and development of Advanced Communication in Europe |
| RAD | Rapid Application Development / Remote Antenna Driver |
| RAD/RASP | Remote Antenna Driver / Remote Antenna Signal Processor |
| RADAR | RAdio Detection And Ranging |
| RADD | Rapid Application Development and Deployment |
| RADF | Reversing Automatic Document Feeder |
| RADIUS | Remote Authentication Dial-In User Service |
| RADSL | Rate Adaptive Digital Subscriber Line |
| RAEBNC | Read and enjoyed but no comment. |
| RAF | Record Address File |
| RAG | Registration and Advisory Group |
| RAI | Remote Alarm Signal |
| RAID | Redundant Array of Independent Disks / Redundant Array of Inexpensive Disk/Drives |
| RAM | Random Access Memory / Remote Access Modem |
| RAMAC | RAID Architecture with Multilevel Adaptive Cache |
| RAMDAC | Random Access Memory Digital To Analog Converter |
| RAMP | Reliability Availability Maintainability Program |
| RAND | Rural Area Network Design |
| RAO | Regional Accounting Office / Remote Automation Objects / Revenue Accounting Office |
| RAR | Return Address Register |
| RARE | Reseaux Associes pour la Recherche Europeenne (Europe - see TERNA) |
| RARP | Reverse Address Resolution Protocol |
| RAS | Remote Access Server / Remote Access Service / Row Address Strobe |
| RASC | Residence Account Service Center |
| RASP | Remote Antenna Signal Processor |
| RBB | Residential Broadband |
| RBDS | Radio Broadcast Data System |
| RBG | Realtime Business Group |
| RBHC | Regional Bell Holding Company |
| RBL | ? |
| RBOC | Regional Bell Operating Company(ies) |
| RBOR | Request Basic Output Report |
| RBS | Robbed Bit Signaling |
| RC | MAC Recent Change Memory Administration Center / Read Committed (isolation level) / Reduced Cost / Regional Center / Remote Control / Resistance-Capacitance / Routing Control |
| RCAC | Remote Computer Access Communications service |
| RCC | Radio Common Carrier / Remote Cluster Controller / Reverse Command Channel |
| RCD | Receiver-Carrier Detector |
| RCF | Remote Call Forwarding |
| RCLDN | Retrieval of Calling Line Directory Number |
| RCM | Remote Carrier Module |
| RCSC | Remote Spooling Communications Subsystem |
| RCU | Radio Channel Unit |
| RCV | Receiver |
| RCVR | Receiver |
| RD | (modem) Receive Data / Remove Directory (DOS) / Route Descriptor |
| RDA | Remote Data Access / Remote Database Access |
| RDAU | Remote Data Access Unit |
| RDB | Relational DataBase |
| RDBA | Remote DataBase Access |
| RDBMS | Relational DataBase Management System / Remote DataBase Management System |
| RDC | Remote Data Concentrator |
| RDES | Remote Data Entry System |
| RDF | Radio Direction Finding / Rate Decrease Factor |
| RDI | Remote Defect Identification / Remote Defect Indicator / Remote Defect Ind |
| RDL | Relational Database Language |
| RDL-SQL | Relational Database Language - Structured Query Language |
| RDLSQL | Relational Database Language Structured Query Language |
| RDM | Report Display Manager |
| RDN | Relative Distinguished Name |
| RDO | Remote Data Objects |
| RDP | Reliable Datagram Protocol |
| RDS | Radio Digital System |
| RDSN | Region Digital Switched Network |
| RDT | Radio Digital Terminal / Recall Dial Tone / Referenced Data Transfer / Remote Digital Terminal / Restricted Data Transmissions |
| RE | Repeat / Returned / Recall (a supplementary service) / Reference Equivalent / Regarding |
| REBI | Reliability of Electronic Business Information |
| REC | RARE Executive Committee / Record (as in tape Record-ing) / Regional Engineering Center |
| RECS | Reseller Electronic Communication System |
| REHI | Hello Again (returned/repeat - Hi!) |
| REJ | Reject |
| REM | Remark / Remote Equipment Module / Ring Error Monitor |
| REMF | Reverse ElectroMagnetic Force |
| REMOB | REMote OBservation |
| REMOBS | REMote OBservation System |
| REN | Rename (DOS) / Ring Equivalence Number / Ringer Equivalence Number |
| REP | Repeater Expansion Port / Repertory Dialing |
| RES | Reserved |
| RESCU | Remote Emergency Satellite ResCue Unit |
| RET | Resolution Enhancement Technology (usually as REt) |
| RETLA | Really Extended Three Letter Acronym |
| REV | Revenue / Revision |
| REXEC | REmote eXECutable/Execution |
| REXX | REstructured eXtended eXecuter (language) |
| RF | Radio Frequency / Resume Flag |
| RF/DC | Radio Frequency / Data Communication |
| RF/ID | Radio Frequency Identification |
| RFA | Remote File Access |
| RFC | [Internet] Request For Comment / Radio Frequency Choke |
| RFD | Regional Frequency Divider / Request For Discussion |
| RFDC | Radio Frequency Data Communication |
| RFI | Radio Frequency Interface/Interference / Request for Information |
| RFID | Radio Frequency Identification |
| RFNM | Request For Next Message |
| RFP | Request For Proposal |
| RFQ | Request For Quotation |
| RFS | Remote File Server/Service / Remote File System |
| RFT | Request For Technology / Revisable Form Text / Revisable Format Text |
| RFTDCA | Revisable Form Text Document Content Architecture |
| RG | Radio Government |
| RGB | Red-Green-Blue |
| RH | Relative Humidity / Request Header / Response Header |
| RHOB | Relevant Hierarchical Operational Binding |
| RI | Reference Implementation / Rename Inhibit / Ring In (MAU Connector) / Ring Indication / Ring Indicator (signal) / Routing Indicator / Routing Information |
| RIB | Routing Information Base |
| RID | Remote Isolation Device |
| RII | Routing Information Indicator |
| RIN | Relative Intensity Noise |
| RIOT | Revolution In Our Time |
| RIP | Rest in Peace / Raster Image Processor / Remote Imaging Protocol / Revolutionizing International Piracy / Router Information Protocol / Routing Information Protocol |
| RIPE | Reseaux IP Europeenne |
| RIS | Remote Installation Service |
| RISC | Reduced Into Silly Code / Reduced Instruction Set Computer(ing) / Reduced Instruction Set Code |
| RISD | Reference Information Systems Development |
| RISE | Retrieval and Interchange of Standards in Europe |
| RISLU | Remote Integrated Services Line Unit |
| RJ | Registered Jack (as in RJ-11 and RJ-45) |
| RJE | Remote Job Entry |
| RL | Real life |
| RLCM | Remote Line Concentrating Module |
| RLE | Run Lenth Encoded (graphic format) |
| RLL | Run Length Limited |
| RLM | Remote Line Module |
| RLOGIN | Remote Login |
| RLSD | Received Line Signal Detector |
| RLT | Remote Line Test |
| RM | Reference Manual/Model / Resource Management |
| RMA | Return Merchandise Authorization |
| RMAS | Remote Memory Administration System |
| RMATS | Remote Maintenance And Testing System |
| RMB | Right Mouse Button |
| RMDIR | Remove Directory (DOS) |
| RMDM | Reference Model of Data Management |
| RMF | Remote Management Facility |
| RMI | (Java) Remote Method Invocation |
| RMON | Remote Monitor standard / Remote network MONitoring |
| RMONMIB | Remote network MONitoring Management Information Base |
| RMP | Remote Maintenance Protocol |
| RMR | Remote Message Register(s) |
| RMS | Root Mean Squared / Record Management Services |
| RMTP | Reliable Multicast Tranport Protocol |
| RN | Receipt Notification / Reference Noise |
| RNA | Ring No Answer (communication or telephone term for a problem) |
| RNE | Reseau National d'Essal (National Network for Testing) |
| RNG | Random Number Generator |
| RNOC | Regional Network Operations Center |
| RNR | Receiver Not Ready |
| RO | Read Only / Receive Only / Remote Operations / Ring Out (MAU connector) |
| RO(T)FL | rolling on the floor laughing |
| ROA | Return On Assets |
| ROAC | Report Origin Authentication Check |
| ROADS | Resources Organisation And Discovery in Subject based Services |
| ROB | Remote Order Buffer |
| ROC | Regional Operating Company |
| ROCIE | Riverside/Orange County/Inland Empire (Net) |
| ROER | Remote Operations ERror |
| ROFFNAR | Rolling on the Floor for no Apparent Reason |
| ROFL | Rolling On (the)Floor Laughing [appropriate response for good jokes] {ROTFL for illiterate people} |
| ROFLAPMP | Rolling On (the)Floor Laughing And Peeing My Pants |
| ROFLASTC | Rolling On (the) Floor Laughing And Scaring The Cat |
| ROFLGO | Rolling On (the) Floor Laughing Guts Out |
| ROFLMAO | Rolling On (the) Floor Laughing My A** Off |
| ROFLMAOAY | ROFLMAO At You |
| ROFLMAOWTIME | ROFLMAO With Tears In My Eyes |
| ROFLOL | Rolling on the Floor Laughing Out Loud |
| ROFLOLBAG | Rolling on the Floor Laughing Out Loud Busting a Gut |
| ROFLUTS | Rolling On (the)Floor Laughing Unable to Speak |
| ROFLWMP | Rolling on the Floor Wetting My Pants |
| ROFPML | Rolling on the Floor Peeing Myself Laughing |
| ROH | Receiver Off-Hook |
| ROI | Return On Investment |
| ROIV | Remote Operations InVoke |
| ROLAP | Relational On-Line Analytical Processing |
| ROLC | Routing Over Large Clouds |
| ROM | Read Only Memory |
| ROP | Raster OPerations |
| ROPM | Remote Operations Protocol Machine |
| RORE | Remote Operations Return Error |
| RORJ | Remote Operations ReJect |
| RORS | Remote Operations ReSponse |
| ROS | Read-Only Store |
| ROSE | Remote Operations Service Element |
| ROT | Reign of Terror |
| ROTBA | Reality on the Blink Again |
| ROTF | Rolling On The Floor |
| ROTF | Rolling On The Floor |
| ROTFL | roll(ing) on the floor laughing (also ROFL; ROFL) |
| ROTFLABIC | Rolling On The Floor Laughing and biting into carpet |
| ROTFLAHMS | Rolling On The Floor Laughing And Holding My Side |
| ROTFLBTC | ROTFL biting the carpet |
| ROTFLBTCUTS | ROTFLBTC .. unable to stop |
| ROTFLGO | ROTFL... guts out |
| ROTFLLTC | ROTFL... licking the glue |
| ROTFLMAO | Rolling On the Floor Laughing My A** Off |
| ROTFLSTC | ROTFL... scaring the cat |
| ROTL | Remote Office Test Lines |
| RPC | Registered Protective Circuitry / Remote Procedure Call |
| RPDFT | Robustly Path Delay Fault Testable |
| RPE | Remote Peripheral Equipment |
| RPG | Remote Password Generator / Report Program Generator (programming language) / Role Playing Game(s) |
| RPI | Rockwell Protocol Interface |
| RPL | Remote Procedure Load / Remote Program Load |
| RPM | Reduced Parts Menu / Relentless Pursuit of Magnificence / Remote Process Management / Revolution Per Minute (usually rpm) / Rotations Per Minute |
| RPN | Reverse Polish Notation |
| RPOA | Recognized Private Operating Agency |
| RPQ | Request for Price Quotation |
| RPS | Redundant Power Supply |
| RPV | Remotely Piloted Vehicle |
| RQS | Rate/Quote System |
| RQSM | Regional Quality Service Management |
| RQT | Reliability Quality Test |
| RR | Ready to Receive / Receiver Ready / Repeatable Read (isolation level) / Reply requested |
| RRO | Reports Receiving Office |
| RRT | Reverse Recovery Time |
| RS | Recommended Standard / Record Separator (ASCII) / Remote Single-layer / Resume Session / Ring Station |
| RSA | Reference System Architecture / Repair Service Attendant / Rivest Shamir and Adleman (Encryption algorithm) |
| RSA-PPDU | ReSynchronize Acknowledge Presentation Protocol Data Unit |
| RSAPPDU | ReSynchronize Acknowledge Presentation Protocol Data Unit |
| RSAT | Reliability and System Architecture Testing |
| RSB | Repair Service Bureau |
| RSC | Remote Switching Center / Residence Service Center |
| RSCS | Remote Source Control System / Remote Spooling and Control/Communications Subsystem |
| RSE | Remote Single-layer Embedded / Removable Storage Elements |
| RSEXEC | Resource Sharing EXECutive |
| RSFG | Route Server Functional Group (ATM Forum) |
| RSH | Remote SHell / Restricted SHell |
| RSI | Repetitive Strain Injury |
| RSL | Received Signal Level / Remote Ship List |
| RSLE | Remote Subscriber Line Equipment |
| RSLM | Remote Subscriber Line Module |
| RSN | Real Soon Now (usually sarcastically) / Remote Switching Module |
| RSO | Regional Standards Organization |
| RSPPDU | ReSynchronize Presentation Protocol Data Unit |
| RS-PPDU | ReSynchronize Presentation Protocol Data Unit |
| RSPX | Remote Sequenced Packet eXchange |
| RSRB | Remote Source Route Bridging |
| RSS | Reception Support Statement / Remote Switching System |
| RSTE/E | Resource System Time Sharing - Enhanced/Extended/Environment |
| RSU | Remote Switching Unit |
| RSVP | Rdb Solutions Vendor Program / Resourse reSerVation Protocol / Revolutionary Surrealist Vandal Party |
| RT | Real-Time / Reliable Transfer / Roundtable / Routing Table / Routing Type |
| RT/DSS | Real-Time/Decision Support Service |
| RTA | Real-Time Accelerator / Remote Trunk Arrangement |
| RTAB | Reliable Transfer ABort |
| RTAS | Real-time Technology and Application Symposium |
| RTBG | RealTime Business Group |
| RTC | Real-Time Clock / RARE Technical Committee |
| RTCP | Real time Transport Control Protocol |
| RTD | Resistance Temperature Detector |
| RTDox | read the documentations |
| RTE | Remote Terminal Emulation |
| RTEL | Reverse TELnet |
| RTF | Rich Text Format |
| RTFAQ | Read The FAQ |
| RTFFAQ | Read The F**king FAQ |
| RTFI | Read the Friendly Instructions |
| RTFM | Read the "fine" manual / read the f#$%ing manual / Read the (Flipping) Manual. / Realtime Traffic Flow Measurement |
| RTI | Remote Terminal Identification |
| RTK | Right - To - Know |
| RTKNET | Right - To - Know NETwork |
| RTM | Read the manual / Resistor-Transistor Logic / Run Time Library / Regional Telecommunications Management / Remote Test Module |
| RTMP | Routing Table Maintenance Protocol |
| RTN | Routing Transit Number |
| RTNR | Ringing Tone No Reply |
| RTOAC | Reliable Transfer Open Accept |
| RTORJ | Reliable Transfer Open Reject |
| RTORQ | Reliable Transfer Open Request |
| RTOS | Real Time Operating System |
| RTP | Real-time Transport Protocol |
| RTPM | Reliable Transfer Protocol Machine |
| RTS | Real-Time System / Reliable Transfer Service / Remote Testing System / Request To Send / Residual Time Stamp |
| RTSE | Reliable Transfer Service Element |
| RTSP | Real Time Streaming Protocol |
| RTT | Round - Trip Time |
| RTTI | Run-Time Type Identification |
| RTTY | Radio Teletype |
| RTU | Remote Trunking Unit |
| RTV | Real-Time Video |
| RU | Read Uncommitted (isolation level) / Request Unit / Response Unit |
| RUA | Remote User Agent |
| RUCUS | Rhodes University Computer Users Society |
| RUIP | Remote User Information Program |
| RUM | Remote User Multiplex |
| RUOK | Are You OK? |
| RVD | (MIT) Remote Virtual Disk |
| RVI | Reverse Interrupt |
| RW | Read - Write |
| RWC | Remote Work Center |
| RWCC | Regional Workshop Coordinating Committee |
| RWSCC | Regional WorkShop Coordinating Committee |
| RX | Receive (Transmission or Data) / Remote Exchange |
| RZ | Return to Zero |
| RZI | Return to Zero Inverted |
R
RADAR :- Radio Detecting and Ranging
RAFC :- Revolutionary Armed Forces of Columbia
RAPP :- Rajasthan Atomic Power Project
RAW :- Research and Analysis Wing
R&D :- Research and Development
RBI :- Reserve Bank of India
RCC :- Reinforced Cement Concrete
RDSO :- Research Design and Standard Organization
RDX :- Research Development Explosive
REACH :- Rural Entrepreneurship for Art and Culture Heritage
RFMT :- Republic of Fiji Military Forces
RGNDWM :- Rajiv Gandhi National Drinking Water Mission
RITES :- Rail India Technical and Economic Services
RMS :- Railway Mail Service
RPNNL :- Rashtriya Pariyojana Nirman Nigam Limited
RRC :- Reactor Research Centre
RLEGP :- Rural Landless Employment Guarantee Programme
RNA :- Ribonucleic Acid
ROSNI :- Round Spermatid Nuclear Injection
RSS :- Rashtriya Swayamsevak Sangh
RTO :- Regional Transport Officer
RTRA :- Rail Tariff Regulatory Authority
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