• R&D Research & Development
• RAD Rapid Application Development
• RAID Redundant Array of Inexpensive Disks
• RAM Random Access Memory
• RARE Reseaux Associes par la Recherche Europeenne
• RARP Reverse Address Resolution Protocol
• RAS Remote Access Services
• RAT Register Alias Table
• RBOC Regional Bell Operating Companies
• RBSE Repository-Based Software Engineering
• RC Routing Control
• RCP Remote Copy Program
• RD Referenced Documents / Received Data / Route Descriptor
• RDA Remote Database Access
• RDBMS Relational DataBase Management System
• REM Ring Error Monitor
• REPOUT REPeater OUTput to Port
• REXX Restructured EXtended EXecutor
• RFC Request For Comments
• RFI Radio Frequency Interference
• RFP Request For Proposal
• RFS Remote File System
• RGB Red Green Blue
• RH Request Header / Response Header
• RHost Remote Host
• RI Ring Indicator / Routing Information
• RII Routing Information Indicator
• RIP Remote Imaging Protocol / Routing Information Protocol
• RIPE Reseaux IP Europeenne
• RISC Reduced Instruction Set Computer
• RJ Registered Jack
• RJE Remote Job Entry
• RLA Remote LAN Access
• RLC Run Length Coding
• RLIN Research Library Information Network
• RLL Run-Length Limited
• rn readnews
• ROB ReOrder Buffer
• ROFL Rolling On Floor Laughing
• ROI Return On Investment
• ROM Read-Only Memory
• ROSE Remote Operations Service Element
• rot13 rotate 13
• ROTFL Rolling On The Floob Laughing
• RPC Remote Procedure Call
• RPS Ring Parameter Service
• RR Register Routine
• RRF Retirement Register File
• RSAC Recreational Software Advisory Council
• RSI Repetitive Stress Injury
• RSN Real Soon Now
• RSX Real-time resource-Sharing EXecutive
• RT Routing Type
• RTC Real-Time Controller
• RTF Rich Text Format
• RTFM Read The Fine Manual
• RTM Run-Time Manager
• RTMP Routing Table Maintenance Protocol
• RTPC RISC Technology Personal Computer
• RTS Request To Send
• RTT Round-Trip Time
• RU Request Unit / Response Unit
• RUIP Remote User Information Program