Electrical 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"

'Ma' to 'Md', 'Me' to 'Ml', 'Mm' to 'Mz'

MMF - Multimode Fiber-optic
MMFM - Modified Modified Frequency Modulation [encoding]
MMW - millimeter wave
modem - modulator-demodulator
MODFET - MOdulation Doped FET [FET Manufacturers]
modified AMI - modified alternate mark inversion code
mol - mole
MON - Metropolitan Optical Network
MOS - Metal Oxide Semiconductor
MOSFET - Metal Oxide Semiconductor Field Effect Transistor
MOTS - Military Off-The-Shelf
MOV - Metal Oxide Varistor [Varistor Manufacturers]
MOVPE - Metal Organic Vapor Phase Epitaxy
MPA - Medium Power Amplifier
MPEG - Moving Picture Experts Group
MPPC - Multi-Pixel Photon Counter
MRAM - Magnetoresistive random access memory [Manufacturers]
ms - millisecond (10-3 second)
MRR - Modulating Retroreflector
MSA - Multi-Sourcing Agreement
MSB - most significant bit
MSI - Medium Scale Integration
MSK - minimum-shift keying
MSS - Multiservice Switch
MTBF - mean time between failures [MTBF Definition]
MTBM - mean time between maintenance
MTBO - mean time between outages
MTBPM - mean time between preventive maintenance
MTF - modulation transfer function
MTJ - Modular Telephone Jack [MTJ Manufacturers]
MTSO - mobile telephone switching office
MTTR - mean time to repair
MUF - maximum usable frequency
MUX - multiplex, multiplexer
MUXing - multiplexing
MVB - Multifunction Vehicle Bus [MVB Definition]
MVH - Micro Via Hole [Dictionary of PWB Terms]
mw - microwave
MWI - message waiting indicator
MWV - maximum working voltage
MZ - Mach-Zehnder

PC motherboard

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