RAB (RAID Advisory Board)
RAID (redundant array of independent [or inexpensive] disks)
RAM (random access memory)
RAMAC (Random Access Method of Accounting and Control)
RAMDAC (RAM digital-to-analog converter)
RBOC (regional Bell operating company)
RCA (Radio Corporation of America)
RDRAM (Rambus DRAM)
RF (radio frequency)
RFI (radio-frequency interference)
RGB (red green blue)
RIAA (Recording Industry Association of America)
RIMM (Rambus inline memory module)
RISC (reduced instruction set computer)
RLL (run length limited)
RMA (return-merchandise authorization)
RNG (random number generator)
ROM (read-only memory)
ROM BIOS (read-only memory basic input-output system)
RPC (regional playback control)
RPS (redundant power supply)
RRIP (Rock Ridge Interchange Protocol)
RS (recommended standard)
RTC (real-time clock)
RTC/NVRAM (real-time clock/nonvolatile memory)
RTF (Rich Text Format)