Browse Acronyms

Browse the acronym list:

M Listing

3MSP
Medicare Major Medical Supplement Plan

M
– mega [million, prefix (10⁶)]
– million(s) [when used with dollars, use only when preceded by dollar sign and one or more numbers; use no space between number and M (e.g., $2M = $2,000,000 or two million dollars)]

m
molal

m
– meter
– milli [one-thousandth, prefix (10^-3)]

M
molar

m·K
meter kelvin

m·kg
meter kilogram

M&C
Metals and Ceramics (Division)

M&E
material and equipment

M&H
Mason & Hanger

M&I
management and integration

M&IE
meals and incidental expenses

M&O
– maintenance and operating
– management and operating

Möss
Mössbauer

M&PS
Micrographics and Printing Services (IMS) (formerly P&DS)

M&S
– Magnetics and Superconductivity
– maintenance and surveillance ("S&M" is preferred)

M&TE
measuring and test equipment

M-G
motor-generator

M-Region
Maunder region

m.
meridiem (12:00 noon)

M.A.
Master of Arts (also A.M.)

M.D.
Doctor of Medicine

M.S.
Master of Science

m/s
meters per second

M/U
maintenance/upgrade

m²
square meter

m³
cubic meter [preferred over liters (L); see restrictions listed under "L" for "liter"]

mA
milliampere

MA
– management and administration
– Management Assessment
– Massachusetts (use only with ZIP code addresses)
– measurement and assessment
– mechanically alloyed

MAA
– Materials Access Area
– Mathematical Association of America
– Mutual Assistance Agreement

MAACS
MELCOR Accident Consequence Code System

MAADS
Modular Artillery Ammunition Delivery System (U.S. Army)

MAB
– Man and the Biosphere
– Marine Amphibious Brigade

MAC
– Management Advisory Council
– Manufacturing Analysis Center
– Military Airlift Command

MACES
Measurement and Controls Engineering Section (I&C)

MACS
– Marine Air Corps Station
– Mobile Automated Characterization System

MACT
– maximum achievable control technology
– maximum available control technology

MAD
– maintenance assembly and disassembly
– Measurement Applications and Development (ORNL office)

MAG
Marine Air Group

MAGIC
Model of Acidification of Groundwater in Catchment

MAGPI
Multi-Agency Working Group on Power Sector Innovation

MAILS
Multiple-Aircraft Instantaneous Line Source (model)

Maine
(spell out unless used with ZIP code addresses)

MAINS
Maintenance Information System

MAJCOM
Major Command

MAJIC
Maintenance, Accountability, Jobs, and Inventory Control System

MALS
Marine Aircraft Logistics Squadron

MAN
Molecular Anatomy (Program)

man-hour
[use "work-hour" (do not abbreviate)]

man-year
[use "work-year" (do not abbreviate)]

MANCOVA
multivariate analysis of covariance

MANOVA
multivariate analyses of variance

MAP
– Maintenance Administrative Procedure
– Manufacturing Automation Protocol
– Mercury Assessment Program
– multielement imaging atom probe
– municipal airport

MAP3S
Multistate Atmospheric Power Production Pollution Study

MAP3S/PCN
Multistate Atmospheric Power Production Pollution Study/Precipitation Chemistry Network

MAPA
Middle Atlantic Placement Association

MAPE
mean absolute percent model

MAPP
Modern Aids to Planning Program

MAPS
manpower analysis and planning survey

MAPTIC
Manufacturing and Processing Technology Integration Center

MAR
– major assembly release
– material at risk

MARCOR
U.S. Marine Corps

MARF
Mechatronics Applied Research Facility (PNC, Japan)

MARMA
Mid-Atlantic Regional Air Management Association

MARS
Management Analysis Reporting System

MAS
– Microbeam Analysis Society
– Military Air Service

MASP
mobile automatic scanning photometer

MASS
Mobilization Automated Support System

Mass.
Massachusetts (use after city names in references, lists, tables, footnotes, bibliographies, and indexes; spell out in text; state name is not needed with Boston)

MAT-WING
Medium Attack Wing

MATCO
Military Air Traffic Coordinating Office

MATCS
Marine Air Traffic Control Squadron

MATD
maximum allowable time delay

MATEX
Matrix Extraction Code

MATMO
Medical Advanced Technologies Management Office

MATS
Military Air Transport Service

MAUC
Materials Analysis User Center (HTML)

MAW
Military Airlift Wing

MAX
Multichannel Narrowband Noise Analysis System Extension (formerly MNNAS)

max
maximum (math)

MB
megabyte (preferred over "Mbyte")

m_b or mb
body-wave magnitude

MBA
material balance area

MBC
model-based compensator

MBCHDM
Mouse Breeding Center for Human-Disease Models

MBD
million barrels per day [convert to SI: million cubic meters per second (m³ × 10⁶/s)]

MBE
molecular beam epitaxy Mbit

MBM
model-based manufacturing

MBMA
Metal Building Manufacturers Association

MBO
management by objective

MBP
monobutyl phosphate

Mbps
million bits per second

MBR
material balance report

MBTTC
Minority Business Technology Transfer Consortium

MBtu
million British thermal units [convert to SI: joule (J)]

MBWA
management by walking around

Mbyte
megabyte ("MB" is preferred)

MC
– major component
– Management Council
– military characteristic
– mirror coil
– Monte Carlo

MC&A
material control and accountability

MCA
– Manufacturing Competitiveness Alliance (DOE, TVA)
– maximum credible accident
– Metropolitan Calling Area
– multichannel analyzer

MCAGCC
Marine Corps Air Ground Combat Center

MCB
– main control board
– Marine Corps Base

MCC
– master control card
– Materials Characterization Center
– Microelectronics and Computer Technology Center (Austin, Texas)
– module control computer
– Motor Control Center

MCCB
machine configuration control board

MCCI
molten-core - concrete interaction

MCDEC
Marine Corps Development and Education Command

MCE
– maximum credible event
– Metrology Center of Excellence

MCF
million cubic feet [convert to SI: million cubic meters (m³ × 10⁶), which is preferred over liters per second (L/s); see restrictions listed under "L" for "liter"]

MCFC
molten carbonate fuel cell

MCFH
million cubic feet per hour [convert to SI: million cubic meters per second (m³ × 10⁶/s)]

mCi
millicurie [convert to SI: becquerel (Bq): sometimes "curie" is acceptable]

MCL
– maximum concentration limit
– maximum contaminant level
– maximum contaminant limit

MCLG
maximum contaminant level goal

MCM
multichip module

MCP
– Military Construction Program
– mobile commandpost

MCPA
Midwest College Placement Association

MCRC
Marine Corps Recruiting Center

MCRD
Marine Corps Recruit Depot

MCS
– Maneuver Control System (U.S. Army)
– Medco Containment Services
– model conservation standards
– multiple chemical sensitivity

MCSA
motor current signature analysis

MCSC
multichannel scaler chip

MCU
– master control unit
– meter control unit

MCV
model containment vessel

Md
mendelevium (element, Z = 101)

MD
– machine design
– Maintenance Division (K-25)
– Maryland (use only with ZIP code addresses)

Md.
Maryland (use after city names in references, lists, tables, footnotes, bibliographies, and indexes; spell out in text; state name is not needed with Baltimore)

MDA
– Material Disposal Area
– minimum detectable activity

MDAC
McDonnell Douglas Astronautics Company

MDB
Munitions Demilitarization Building

MDD
modified direct denitration

MDEG
Model and Data Evaluation Group

MDIF
metal-dielectric interference filter

MDL
– Mechanical Development Laboratory
– method detection limit

MDMS
Maintenance Data Management System

MDNR
– Maryland Department of Natural Resources
– Missouri Department of Natural Resources

MDP
Methanol Demonstration Program

MDRC
Multichannel Digital Recorder Controller

MDRL
Metrology Research and Development Laboratory

MDS
monitoring and display system

MDSU
Mobile Diving Salvage Unit

MDU
modular disposal unit

ME
– Maine (use only with ZIP code addresses)
– Metairie Site Office (DOE)

MEC
Model Energy Code

MECL
Motorola emitter coupled logic

MECS
Minnesota Energy Conservation Service

MED
Manhattan Engineering District

MEDR
mid-energy digital radiography

MEE
maximum expected earthquake

Mω
megohm

MEHC
metallurgical examination hot cell

MEI
– maximum exposed individual
– minority educational institution

MEK
methyl ethyl ketone

MEL
– master equipment list
– modular electromagnetic levitator

MEL-FS
Multiprogram Energy Lab - Facilities Support Programs MENS

MEOR
microbially enhanced oil recovery

MEP
– Maintenance Engineering Procedure
– mobile electric power

MEPAS
Multimedia Environmental Pollutant Assessment System

meq
milliequivalent

MER
medium reiteration (genomic frequency sequence)

MERL
Municipal Environmental Research Laboratory

MESA
Mining Enforcement and Safety Administration (DOI)

MET
Monitoring Engineering Team

METC
– Medium Energy Technology Center
– Morgantown Energy Technology Center

METF
Medium Energy Test Facility

METR
Man Equivalent Telerobot

METS
Mechanized Export Traffic System

METS II
Mechanized Export Traffic System II

MEU
– multiport Ethernet unit (computer term)
– medium-enriched uranium

MeV
megaelectronvolt (million electron volts or 10⁶ volts) [convert to SI: joule (J); sometimes "eV" is acceptable]

mF
millifarad

mf
medium frequency

MFA
multifunctional appraisal

MFC
mass flow controllers

MFCDL
Mass Flow Controller Development Laboratory (I&C Division)

MFD
magnetic flux density

MFE
magnetic fusion energy

MFEP
Magnetic Fusion Energy Program

Mfg.
Manufacturing (spell out in text; abbreviate in references, lists, tables, footnotes, bibliographies, and indexes)

MFI
multifamily energy-use index

MFLOPS
millions of floating-point operations per second (measure of computer processing capability)

MFO
mixed-function oxidase (enzyme system)

mfp
mean free path

MFR
– Memo for Record
– U.S. Navy multifunction RADIAC instrument

Mfr.
Manufacturer (spell out in text; abbreviate in references, lists, tables, footnotes, bibliographies, and indexes)

MFSS
Master Fan Shutdown System (ORNL)

MFT
Manufacturing Evaluation Team

MFTF
Mirror Fusion Test Facility (LLNL)

mG
milligauss

Mg
– magnesium (element, Z = 12)
– megagram (or megaton)

mg
milligram

Mg(NO₃)₂
magnesium nitrate

MGA
Mitchell and Gauthier Associates

MgCl₂
magnesium chloride MgF₂

Mgd
million gallons per day [convert to SI: million cubic meters per second (m³ × 10⁶/s), which is preferred over liters per second (L/s); see restrictions listed under "L" for "liter"]

MGMS
matrix-induced-gradient magnetic separation

MgO
magnesium oxide

mgpd
million gallons per day

MGPF
multiprogram general-purpose facility

mgr.
manager

mgt.
management

MH
– mail handler (UNIX)
– maintenance hole (formerly "manhole")

mH
millihenry

MHD
magnetohydrodynamic(s)

MHD-EMP
magnetohydrodynamic electromagnetic pulse

MHDM
– materials handling demonstration module
– materials handling development module

MHLQR
multiple-hazard, limited-quantity, radioactive

mho
[do not abbreviate this word; convert to SI: siemens (S)]

MHRS
Modified Hazard Ranking System (DOE)

MHTGR
modular high-temperature gas-cooled reactor

MHz
megahertz

MI
– Michigan (use only with ZIP code addresses)
– mineral insulated

MIA
– Missing in Action
– Multivendor Integration Architecture

MIBK
methyl isobutyl ketone

MICA
Modular Integrated Control Architecture (ORNL)

Mich.
Michigan (use after city names in references, lists, tables, footnotes, bibliographies, and indexes; spell out in text; state name is not needed with Detroit)

MICOM
Missile Command (U.S. Army)

microequivalent
(do not abbreviate this word)

MID
– Mechanical Inspection Department
– Merced Irrigation District
– momentum-induced discrimination

MIDAC
Michigan Digital Automatic Computer

MIDAS
Maintenance Information and Data Acquisition System

MIDP
Management Intern Development Program

MIE
major item of equipment

MIF
Materials Radiation Facilities (HFIR)

MIG
– maintenance importance generator
– metal inert gas

mil
[do not abbreviate this word; convert to SI:meter (m)]

MIL-STD
military standard

mile
[do not abbreviate this word; convert to SI: kilometer (km)]

mile²
square mile [do not abbreviate either of these words; convert to SI: square meter (m²)]

MILES
Multiple Integrated Laser Engagement System

mill
(do not abbreviate this word)

mω
milliohm

mils/year
mils per year [do not abbreviate either of these words; convert to SI: meters per year (m/year)]

Milspec
military specification

MIMD
multiple instruction, multiple data

MIME
Multipurpose Internet Mail Extension

MIMO
multiple input/multiple output

min
– minimum (math)
– minute

Minn.
Minnesota (use after city names in references, lists, tables, footnotes, bibliographies, and indexes; spell out in text; state name is not needed with Minneapolis or St. Paul)

MINSY
Mare Island Naval Ship Yard

MIP
Maintenance Implementation Plan (I&C Division)

MIPR
Military Interdepartmental Purchase Request

MIPS
millions of instructions per second

MIR
– major impact report
– maximum individual risk
– Medical Incident Report

MIRACL
mid-infrared advanced chemical laser

MIRT
minority institution research travel

MIRV
multiple independently targeted reentry vehicle

MIS
– Major Item System
– management information system
– Mobile IncinerationSystem (EPA)

MIS-CD
Major Item System Code

MISM
Major Item System Mapping (project)

Miss.
Mississippi (use after city names in references, lists, tables, footnotes, bibliographies, and indexes; spell out in text)

MIST
Minor Isotopes Safeguards Technique

MIT
– Massachusetts Institute of Technology (Cambridge, Massachusetts)
– mechanical integrity test

MITI
Ministry of International Trade and Industry (Japan)

MIUS
Modular Integrated Utility Systems

MIVRML
Mobile In-Vitro Radiation Monitoring Laboratory

MJ/m³
megajoules per cubic meter MJ

MJR
Maintenance Job Request

MK-F
MK-Ferguson of Oak Ridge Company

MKS
meter-kilogram-second (measurement system; replaced by SI) ("mks" is preferred)

mks
meter-kilogram-second (measurement system; replaced by SI) (preferred over "MKS")

mksa
meter-kilogram-second-ampere (measurement system; replaced by SI) (preferred over "MKSA")

MKSA
meter-kilogram-second-ampere (measurement system; replaced by SI) ("mksa" is preferred)

ML
material list

mL
milliliter [cubic meter (m³) is preferred; see restrictions listed under "L" for "liter"]

MLC
Military Liaison Committee

MLE
– maximum likelihood estimate
– most likely exposure

MLGW
Memphis Light, Gas, and Water

MLI
Microwave Laboratories, Inc.

MLIS
Molecular Laser Isotope Separation

MLLW
mixed low-level radioactive and hazardous waste

MLM
maintenance line management

MLO
Mauna Loa Observatory, Hawaii

MLP
mobile launch platform

MLR
– maximum lifetime risk
– multiple linear regression

MLRS
Multiple Launch Rocket System

MM
– Modified Mercalli
– monomethylmercury

mm
millimeter

mM
millimole

MM-Al
total monomeric aluminum

mm²
square millimeter

mm³
cubic millimeter

MMA
Material Access Area

MMAD
mass median aerodynamic diameter

MMARC
Martin Marietta Amateur Radio Club

MMC
Martin Marietta Corporation (now Lockheed Martin Corporation)

MMCF
Martin Marietta Corporation Foundation

MMCFS
Martin Marietta Corporation Foundation Scholarship

MMD
– Maintenance Management Department (I&C Division) (now TSD)
– mass median diameter

MMEF
Macromolecule Mapping and Engineering Facility

mmf
magnetomotive force

MMI
– man/machine interface
– material manager's inventory
– Modified Mercalli Intensity

MMIC
millimeter-wave integrated circuit

MMIS
Materials Management Information System

MMLC
Mobile Manufacturing Learning Center (CMT)

MMMS
Minerals, Metals and Materials Society

MMMSP
Medicare Major Medical Supplement Plan

MMO
– Material Management Organization
– monooxygenase

mmol
millimole

MMPR
Maintenance Management Program Rule (also known as the Maintenance Rule)

MMR
Massachusetts Military Reservation

MMS
– Materials Management System (ORNL)
– Minerals Management Service (DOI)
– modular modeling system

MMSC
Martin Marietta Specialty Components

MMT
– Materials and Manufacturing Technology (Laboratory)
– Molten Metal Technology, Inc.

mmu
milli-mass-unit

MMUS
Martin Marietta Utility Services

Mn
manganese (element, Z = 25)

MN
Minnesota (use only with ZIP code addresses)

MNCV
National Capacity Variance (EPA)

MNL
multinomial logit model

MNNAS
Multichannel Narrowband Noise Analysis System (now MAX)

MNP
Microcom Network Protocol

MNS
master nuclear schedule

Mo
molybdenum (element, Z = 42)

MO
Missouri (use only with ZIP code addresses)

MO&CA
mission operations and cost analysis

Mo.
Missouri (use after city names in references, lists, tables, footnotes, bibliographies, and indexes; spell out in text; state name is not needed with St. Louis)

MOA
– Memorandum of Agreement
– Military Operation Area

MOC
– memorandum of cooperation
– mobile operations center

MOCA™
compound 4,4-4'-methylenebis-(2-chloroani-line) (trademark of E. I. du Pont de Nemours and Company)

MOCVD
metal organic chemical vapor disposition

MOD
motor-operated disconnect

mod
modulus (math)

MoD-Std
Ministry of Defense Standard (U.K.)

MODIL
Manufacturing Operations Development and Integration Laboratory

MOGAS
motor gasoline

MOHIS
Medical Occupational Health Information System

MOI
– management, organization, institution
– Memorandum of Intent

mol
mole

mol %
mole percent

mol. wt
molecular weight

MONAL
Mobile Nondestructive Assay Laboratory

MONOB
Mobile Noise Barge

MONT
Montrose District Office (DOE)

Mont.
Montana (use after city names in references, lists, tables, footnotes, bibliographies, and indexes; spell out in text)

month
(do not abbreviate this word)

MORT
Management Oversight and Risk Tree

MORT/A-I
Management Oversight and Risk Tree Accident Investigation

MOS
– metal-oxide semiconductor
– military occupational specialty

MOSC
Mobil Oil Sludges

MOSFET
metal-oxide-semiconductor field-effect transistor

MOSIS
– Metal-Oxide-Semiconductor Implementation System
– modular survey instrument system

MOTA
Materials Open Test Assembly [Facility (of FFTF)]

MOTEL
Motorola Intel

MOU
Memorandum of Understanding

MOV
– metal oxide varistor
– motor-operated valve

MOX
mixed-oxide fuel (uranium and plutonium)

MP
– major project
– melting point

MP&T
modified purge and trap vial

MPa
megapascal

MPC
– main process cell
– maximum permissible concentration
– Metal Properties Council
– multimedia personal computer
– multipurpose canister

MPD
– maximum permissible dose
– Metal Preparation Division

MPDAC
Mechanical Properties Data Analysis Center

MPE
manager of product excellence

MPEG
Moving Picture Experts Group

MPF
– maximum probable flood (flooding without dam break; see PMF)
– metal parts furnace
– Metal Processing Facility

mpg
miles per gallon [convert to SI: kilometers per cubic meter (km/m³), which is preferred over kilometers per liter (km/L); see restrictions listed under "L" for "liter"]

mph
miles per hour [convert to SI: kilometers per hour (km/h) or meters per second (m/s)]

MPI
maximum permissible intake

MPM
– mechanical properties microprobe
– microscopic process monitoring

MPOB
maximum permissible organ burden

MPP
– massively parallel processing
– Massively Parallel Processor
– Modular Power Plant (library)
– multipinned phase

MPRE
Medium Power Reactor Experiment

MPRSA
Marine Protection, Research, and Sanctuaries Act

MPS
– microprocessor status
– Minimum Property Standards (HUD)

MPST
modified pair-selected ternary

MPT
Manpower, Personnel, and Training (USN)

mR
milliroentgen [convert to SI: coulombs per kilogram (C/kg); sometimes "roentgen" is acceptable]

MR
Material Request (AVID)

MRAC
model reference adaptive controller

mrad
millirad [convert to SI: gray (Gy); sometimes "rad" is acceptable]

MRAL
Mobile Radionuclide Analysis Laboratory

MRB
– Management Review Board
– Material Review Board

MRBM
Medium-Range Ballistic Missile

MRBT
multirod burst test

MRC
– Marine Review Committee
– Microcomputer Resource Center (ORNL)
– Mission ResearchCorporation

MRCA
Midwest Roofing Contractor's Association

MRDL
– Measurement Research Development Laboratory (I&C Division)
– Metrology Research and Development Laboratory

MRE
medical review entities

mrem
millirem (use same for plural) [convert to SI: sievert (Sv); sometimes "rem" is acceptable]

MRF
Metal Recovery Facility

MRI
magnetic resonance imaging

MRMC
Medical Research and Material Command

mRNA
messenger RNA

MRR
material removal rate

MRS
– man-robot symbiosis
– Materials Research Society
– monitored retrievable storage

MRSC
maintenance and rebuild support definition

MRSF
Monitored Retrievable Storage Facility

MS
– mail stop
– mass spectroscopy
– matrix spike
– Mississippi (use only with ZIP code addresses)
– most significant
– Richter magnitude

Ms
– martinsite start temperature
– megasecond

ms
millisecond

MS&E
Materials Science and Engineering

MS/MS
– mass spectrometry/mass spectrometry
– tandem mass spectrometry

MSA
– major systems acquisition
– management self-assessment
– mean-square ampere
– Metropolitan Statistical Area
– Microscopy Society of America

MSB
most-significant bit

MSBR
Molten Salt Breeder Reactor

MSC
– Manufacturing Skills Campus
– Military Sealift Command

MSCO
Military Sealift Command Office (Norfolk, Virginia)

MSCR
Molten Salt Converter Reactor

MSD
– Marketing Support Division (MMES)
– Material Sciences Division
– matrix spike duplicate

MSDS
– Materials Safety Data Sheet
– Market Shares Data System

MSE
– molten-salt extraction
– Mountain States Energy, Inc.

MSEB
Mathematical Sciences Education Board (National Research Council)

MSEC
Materials Science and Engineering Complex

MSEL
Master Sequence of Events List

MSF
multistage flash

MSFC
Marshall Space Flight Center

MSG
– Management Services Group
– monosodium glutamate

MSHA
Mine Safety and Health Administration (DOL)

MSI
– motion sickness incidence
– multisensor integration

MSIV
main steam isolation valve

MSL
– Management Systems Laboratories
– Mass Spectrometry Laboratory (ORNL)
– mean sea level (see AMSL and NGVD)
– minimum safe level

MSM
– master slave manipulator
– multivariable stability margin

MSMO
major site maintenance organization

MSPB
Merit Systems Protection Board

MSR
– Maintenance Service Request
– moisture separator reheater
– Molten Salt Reactor

MSRE
Molten Salt Reactor Experiment

MSREF
Molten Salt Reactor Experiment Facility

MSRP
Molten Salt Reactor Program

MSRS
Material Safety Reference Sheet

MSS
– Management Services Section (IMS)
– Mass Storage System
– multispectral scanner

MSSA
Master Safeguards and Security Agreement

MSSE
Mathematics and Science Summer Experiences (program)

MSTIMP
Management of Scientific and Technical Information Management Program (DOE)

MSTMC
Materials and Structures Technology Management Center

MSTS
microwave signal transmission system

MSV
– mean square voltage
– modular storage vault

MSW
municipal solid waste

MSWU
million separative work units

MT
– Montana (use only with ZIP code addresses)
– muffin-tin approximation

Mt
– metagon [do not abbreviate; spell out to avoid confusion with "metric ton" (see Mton)]
– meitnerium (element, Z = 109)

mT
millitesla

MTBE
methyl tertiary butyl ether

MTBF
mean time between failures

MTDC
Manufacturing Technology Deployment Center

MTF
– Memorandum to File
– modulation transfer function

MTG
methanol to gasoline

MTHM
metric tons of heavy metal

MTI
Mechanical Technology, Inc.

MTIHM
metric tons of initial heavy metal

MTL
maximum tolerable level

MTM
million-ton-miles

MTMC
Military Traffic Management Command

Mton
megaton (spell out to avoid confusion with "metric ton") (see Mt)

MTPP
Military Traffic Management Command's Personal Property Directorate

MTR
– Materials Testing Reactor
– Military Training Route
– minimum technological requirements

MTRMPC
Middle Tennessee Regional Minority Purchasing Council, Inc.

MTS
methyltrichlorosilane

MTSS
Metallic Thermal Storage System

MTTF
mean time to failure

MTTR
mean time to repair

MTU
– materials test unit
– metric ton unit
– metric tons of uranium
– mobile treatment unit

MTX
Microwave Tokamak Experiment

MU
measurement unit

MUD
Maintenance and Utilities Division (now FMD)

MUDSO
Maintenance and Utilities Standing Order

MUF
materials unaccounted for

MUG
meter-under-glass (method)

MUOM
monolithic uranium oxide material

MURR
Missouri University Research Reactor

MUSC
Medical University of South Carolina

MUX
multiplexer

MV
megavolt

mV
millivolt

mV/m
millivolts per meter

MVA
megavolt-ampere

Mvar
megavar (megavolt-ampere reactive)

MVIP
Machine Variables Instrument Package

MVMA
Motor Vehicle Manufacturers Association

MVS
Multiple Virtual Storage

MVST
Melton Valley storage tanks

MVST-CIP
Melton Valley Storage Tank Capacity Increase Project

mW
milliwatt

MW
– megawatt
– mixed waste
– molecular weight
– monitoring well

MW(e)
megawatt (electrical) [see MW(t)]

MW(t)
megawatt (thermal) [see MW(e)]

MW-year
megawatt-year

MWC
municipal waste combustor

MWd
megawatt-day

MWh
megawatt-hour

MWI
Mixed Waste Inventory

MWIP
Mixed-Waste Integrated Program (DOE-EM, OTD, ORNL)

MWL
municipal waste leachate

MWMF
Mixed Waste Management Facility

MWPD
multiwire proportional detector

MWPP
municipal water pollution prevention

MWR
maintenance work request

MWS
Missile Warning System

MWs
megawatt-second

MWSEP
Mixed Waste Storage Expansion Program (K-25)

MWTC
Mountain Warfare Training Center

MWTF
Mixed Waste Treatment Facility

Mx
maxwell [convert to SI: weber (Wb)]

MYL
middle year of license

MYR
middle year of relicense

µA
microampere

µA·h
microampere-hour

µC
microcoulomb

µCi
microcurie [convert to SI: becquerel (Bq); sometimes "curie" is acceptable]

µF
microfarad

µg
microgram

µH
microhenry

µω
microhm

µin.
microinch

µL
microliter [cubic meter (m³) is preferred over liter; see restrictions listed under "L" for "liter"]

µm
– micrometer
– micron (do not use "µ" alone)

µmol
micromole

µM
micromolar

µN
nuclear magneton

µR
microroentgen

µs
microsecond

µV
microvolt

µW
microwatt