Engineering Abbreviations
"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"
'Oa' to 'Om', 'On' to 'Oz'
| O&M | - | operations and maintenance |
| OBDII | - | On-Board Diagnostics II Bus [OBDII Bus], [OBDII Terms] |
| OC | - | Open Collector [Transistor Manufacturers] |
| OC | - | operations center |
| OC1 | - | Optical Carrier, Level 1 |
| OCC | - | Other Common Carrier |
| OCR | - | Optical Character Reader |
| OCR | - | optical character recognition |
| OCU | - | Orderwire Control Unit |
| OCUR | - | OpenCable Unidirectional Receiver |
| OCVCXO | - | Oven controlled-voltage controlled crystal oscillator |
| OCXO | - | oven controlled crystal oscillator [OC Manufacturers] |
| OD | - | Optical Density |
| OD | - | Outside Diameter |
| ODD | - | Optical Disk Drive |
| ODI | - | Open Data-link Interface |
| ODU | - | Optical channel Data Unit |
| OEM | - | Original Equipment Manufacturer [List of Manufacturers] |
| O-E-O | - | Optical-Electrical-Optical |
| OFC | - | Optical Fiber Conductive |
| OFCC | - | Optical Fiber Cable Component |
| OFCP | - | Optical Fiber Conductive Plenum |
| OFCR | - | Optical Fiber Conductive Riser |
| OFN | - | Optical Fiber Nonconductive |
| OFNP | - | Optical Fiber Nonconductive Plenum |
| OFNR | - | Optical Fiber Non-conductive Riser |
| OH | - | Overhead |
| OLED | - | Organic light-emitting diode [Displays] |
| OLMC | - | Output Logic Macrocell |
| OLT | - | Optical Line Terminal |
| OMB | - | Office of Management and Budget |
