| Acronym | Meaning |
 | ROZ | Restricted Operations Zone |
| RP | Philippines (FIPS 10-4 Country Code) -Release Point - Role-Playing |
| RPA | Regional Plan Association |
| RPD | Recognition-Primed Decision-making |
| RPG | (US-CA) Regional Planning Group - Report Program Generator - Rocket Projectile Gun - Rocket-Propelled Grenade - Role-Playing Game |
| RPL | Reverse Polish Lisp |
| RPM | Red Hat Package Manager |
| RPM | Revolutions Per Minute |
| RPN | Reverse Polish Notation |
| RPO | Radiation Protection Officer |
| RPR | FOM - Realtime Platform Reference Federation Object Model (reaper Fomm) |
| RPS | Revolutions Per Second |
| RPV | Remotely Piloted Vehicle |
| RQ | Puerto Rico (FIPS 10-4 Territory Code) |
| RRN | Recurrence Rate Number |
| RRP | Recurrent Respiratory Papillomatosis |
| RRS | Racing Rules Of Sailing |
| RRSP | Registered Retirement Savings Plan (Canada; Roughly Equivalent To The IRA In The U.S.) |
| RS | Russia (FIPS 10-4 Country Code) |
| RSA | Regimental Support Area - Republic Of South Africa -Rivest-Shamir-Adleman Encryption |
| RSD | Reflex Sympathetic Dystrophy -Serbian Dinar (ISO 4217 Currency Code) |
| RSI | Repetitive Strain Injury |
| RSJ | Rolled Steel Joist (construction) |
| RSN | Real Soon Now (coined By Author Jerry Pournelle) |
| RSPB | (UK) 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 (1976?1991) |
| RSS | Really Simple Syndication |
| RSTA | Reconnaissance |
| RSVP | Répondez S'il Vous Plaît. A French Phrase That Translates To "please Respond" And Word For Word Translation Is "respond If You Please." It Is Standard Practice To Reply To An RSVP Request Whether Confirming Attendance Or Declining. |
| RT | PCR -Real Time Polymerase Chain Reaction Or Reverse Transcriptase Polymerase Chain Reaction. Clarified With Real Time RT-PCR Or Reverse Transcriptase RT-PCR Where Appropriate. |
| RT | Real Time - Radio Telephone -Return To Duty |
| RTA | Road Traffic Accident (British) |
| RTBF | Radio-T?l?vision Belge De La Communaut? Fran?aise |
| RTF | Rich Text Format |
| RTFM | Read The Fucking/Fine Manual |
| RTG | Radio-isotope Thermoelectric Generator Also Used For Rubber Tyred Gantry Crane |
| RTGS | Royal Thai General System Of Transcription - Real Time Gross Settlement |
| RTI | Run-Time Infrastructure (Simulation) |
| RTL | See Entry |
| RTLS | Return To Launch Site - Period In NASA Space Shuttle Assent Profile Where |
| RTP | Real-time Transport Protocol |
| RTS | See Entry |
| RTT | Round Trip Timing |
| RTV | Rapid Terrain Visualization ACTD |
| RT | Radio Telefs ireann |
| RU | Russia (ISO 3166 Digram) |
| RU | Russian Language (ISO 639-1 Code) |
| RU | Ruthenium |
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