"A",
"B",
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
'Ra' to 'Rh', 'Ri' to 'Rz'
| racon | - | radar beacon |
| rad | - | radian |
| RAD | - | radiation absorbed dose |
| RAID | - | redundant array of independent discs |
| Radar | - | radio detection and ranging |
| RADHAZ | - | electromagnetic radiation hazards [Sign Manufacturers] |
| RADINT | - | radar intelligence |
| RAM | - | Random Access Memory [Manufacturers of RAM IC's] |
| RAM | - | reliability, availability, and maintainability |
| R&D | - | research and development |
| RAS | - | Row Address Strobe [memory] |
| RATT | - | radio teletypewriter system |
| RBOC | - | Regional Bell Operating Company |
| RbXO | - | rubidium-crystal oscillator [RbXO Manufacturers] |
| RC | - | reflection coefficient, Radio Control, resource controller |
| RCC | - | radio common carrier |
| RCVR | - | receiver |
| RCD | - | Residual Current Device [RCD Graphic] |
| RD | - | Read |
| RDF | - | radio-direction finding |
| RDIMM | - | Registered DIMM [Memory Module Manufacturers] |
| RDRAM | - | Rambus DRAM [Memory IC Manufacturers] |
| RDY | - | Ready |
| REA | - | Rural Electrification Administration |
| REF | - | Reference |
| RET | - | Reliability Enhanced Testing |
| rf | - | radio frequency |
| RF | - | range finder |
| RFC | - | Radio Frequency Choke [RFC Manufacturers] |
| RFI | - | Radio Frequency Interference |
| RFID | - | Radio Frequency Identification |
| RFP | - | Request For Proposal |
| RFQ | - | Request For Quotation |
| RGB | - | Red-Green-Blue [Video Interface] |
| RH | - | Relative Humidity |
| RHR | - | Radio Horizon Range |
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Next set of "R" Acronyms, Abbreviations
