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

PC motherboard

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