R

R0          Record zero

RACF        Resource Access Control Facility

RAID        Redundant Array of Inexpensive Disks

RAID        Redundant Array of Independent Disks

RAM         Random Access Memory 

RARP        Reverse Address Resolution Protocol

RBA         Relative Byte Adresse

RC          Robot Control

RCP         Remote Communication Processor

RCS         Revision Control System

RDA         Remote Data Access

RDBMS       Relational DataBase Management System

RDN         Relative Distinguished Name

RES         Restore

RF          Resume Flag

RFC         Request For Comments

RFF         Required Form Feed

RFS         Remote File System

RGB         Red, Green, Blue

RGM         Red, Green, Blue (Monitor)

RIFF        Resource Interchange File Format

RIP         Raster Image Processor

RIP         Router Information Protocol

RISC        Reduced Instruction Set Computer

RJE         Remote Job Entry

RL          Relocatable Library

RLD         Relocation Dictionary

RLE         Run Length Encoded file

RLL         Run Length Limited

RMF         Resource Management Facility

RNL         Required New Line

ROM         Read Only Memory 

RPC         Remote Procedure Call

RPG         Report Program Generator

RPL         Requestor's Privilege Level 

RPL         Research Programming Language

RPM         Revolutions Per Minute

RPS         Rotational Position Sensing

RPT         Repeat

RRDS        Relative Record Data Set

RRED        Right Reading Emulsion Down

RREU        Right Reading Emulsion Up

RS          Record Separator

RSP         Required Space

RSVP        Resource Reservation Protocol

RTC         Real Time Clock

RTCP        Realtime Transport Control Protocol

RTF         Rich Text Format

RTM/SF      Realtime Monitor / Systems Facility

RTP         Realtime Transport Protocol

RTSE        Reliable Transfer Service Element

RWSI        Remote Workstation Interface