Computer Glossary


LSD Least Significant Digit



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LSD Least Significant Digit

LSI Large Scale Integration

LSL Link Support Layer + Load Segment Limit

LST List

.LST List (file name extension)

LTR Left-To-Right + Letter + Load Task Register

LU Logical Unit (Also LUN)

LUA Logical Unit Application (interface)

LUI Local User Input

LUIS Library User Information Service

LUN Logical Unit Number

LUT Lookup Table

LV Logical Volume [IBM]

LVDS Low-Voltage Differential Signaling

LVM Logical Volume Management [IBM]

LW Lazy Write

.LYR Lyrics (music file name extension)

LZW Lempel-Ziv-Welch (algorithm)

mA Milliampere

Mac Macintosh (Apple Macintosh Computer)

MAC Media/Medium Access Control +

Message Authentication Code

MAC * Multiple Access Computers

.MAC MacPaint (file name extension) +

Macro (file name extension)

MACH Multilayer Actuator Head [Epson]

MADE Manufacturing and Automated Design Engineering

MADYMO Mathematical Dynamic Modeling [TNO]

MAE Metropolitan Area Ethernet

MAGMA Minimal Architecture for Generalized Markup Applications

mAh Milliampere-Hour

MAI Multiple Applications Interface

.MAI Mail (file name extension)

MAN Manual [Unix] + Metropolitan Area Network

MSC Management Systems Consulting, Inc.

MANIAC * Mathematical Analyzer Numerical

Integrator and Computer


MANPAGE Manual Page [Unix]

MAP Maintenance Analysis Procedures +

Manufacturing Automation Protocol +

Memory Allocation Map

.MAP Linker Map (file name extension)

MAPI Mail/Messaging Applications Programming

Interface [Microsoft]

MAPICS Manufacturing, Accounting and Production

Information Control System [IBM]

MARC Machine Readable Cataloging +

Multi-Technology Automated Reader Card

MARVEL Machine-Assisted Realization of the Virtual

Electronic Library [Library of Congress]

MASM Macro Assembler [Microsoft]

MASS Maximum Availability and Support

Subsystem [Parallan]

MAT Maintenance Access Terminal

MAU Media Access/Adapter Unit + Multistation Access Unit

MAVDM Multiple Application VDM

MAX Maximum

MB Megabyte (1,024 kilobytes) +

Middle Button (of 3 button Mouse)

MBASIC Microsoft BASIC [Microsoft]

MBCS Multi-Byte Character Set [IBM]

MBONE Multicast Backbone [Internet]

MBps Megabytes Per Second

Mbps Megabits Per Second

MBR Master Boot Record

MBX Mailbox

MCA Micro Channel Adapter/Architecture [IBM]

MCAD Mechanical Computer Aided Design

MCB Memory Control Block

MCF Meta Content Framework

MCGA Multicolor Graphics Array

MCI MCI Communications Corp. (name from initials of


original company - Microwave Communications, Inc.) +

Media Control Interface [Microsoft]

MCL Microsoft Compatibility Labs [Microsoft]

MCM Multi-Chip Module

MCNE Master Certified Novell Engineer [Novell]

MC-PGA Metallized Ceramic - Pin Grid Array

MCPS Microsoft Certified Product Specialist [Microsoft]

MC-QFP Metallized Ceramic - Quad Flat Pack

MCR Modem Control Register

MCSE Microsoft Certified Systems Engineer [Microsoft]

MCU Microcontroller Unit + Multi-Chip Unit [DEC] +

Multipoint Control Unit

MD Make Directory + Mini Disk [Sony] + Monochrome Display

MDA Monochrome Display Adapter +

Multidimensional Analysis

MDDBMS Multidimensional Data Base Management System

.MDF Menu Definition File (file name extension)

MDI Memory Display Interface +

Multiple Document Interface

MDIC Manchester Decoder and Interface Chip [AT&T]

MDK Multimedia Developers Kit [Microsoft]

MDLP Mobile Data Link Protocol

MDR Minimum Design Requirement

MDY Month Day Year

.ME Opening Information (file name extension) (As in READ.ME)

MEB Memory Expansion Board

MEG Megabyte

MEM Memory

.MEN Menu (file name extension)

MERCI Multimedia European Research Conferencing Integration

MES Manufacturing Execution System

MESI Modified, Exclusive, Shared and Invalid (protocol)

MET Memory Enhancement Technology [Hewlett-Packard]


.MET Metafile (file name extension)

MFC Microsoft Foundation Class [Microsoft]

MFFS Microsoft Flash File System [Microsoft]

MFI Multifunction Interpreter

MFLOPS Million Floating Point Operations Per Second

MFM Modified Frequency Modulation

MFP Multi-Function Peripheral/Product

MFPI Multifunction Peripheral Interface

MFS Macintosh File System [Macintosh] +

Magnetic Tape Field Search + Memory File System

Modified Filing System [Revelation Technologies]

MFT Master File Table +

Multiprogramming with a Fixed number of Tasks

MGA Monochrome Graphics Adapter

MGE Modular GIS Environment

MGET Multiple Get [Unix]

MGML Minimal Generalized Markup Language

MGR Manager

MHS Message Handling Service + Message Handling System

MHz Megahertz

MI Management Interface

MIB Management Information Base

MICR Magnetic Ink Character Recognition

MICRO One-millionth

MICS Macro Interpretive Commands

MIDI Musical Instrument Digital Interface

MIF Management Information Format

.MIF Management Information Files (file name extension)

MIG Metal In Gap

MII Microsoft/IBM/Intel

MIL Machine Interface Layer [Go Corporation] +

.MIL Military (Domain name) [Internet]

MIM Metal-Insulator-Metal (screen)

MIMD Multiple Instruction Multiple Data Stream (processor)

MIME Multipurpose Internet Mail Extension [Internet]

MI/MIC Mode Indicate/Mode Indicate Common


MIN Minimum + Mobile Identification Number

MIND Microsoft Internet Developer [Microsoft]

MINUET Minnesota Internet Users Essential Tools [Internet]

MIPS Million Instructions Per Second

MIS Management Information System +

Multimedia Information Sources [Internet]

MISC Miscellaneous

MIX Member Information Exchange

MKDIR Make Directory

ML Machine Language + Meta Language

MLAPI Multilingual Application Programming Interface

MLC Multilayer Ceramic +

Multilevel Cell (program) [Internet]

MLE Multi-Line Editor

MLID Multi-Link Interface Driver

MLM Mailing List Manager [Internet]

MLPPP Multilink PPP

MM Minutes + Month

MMA Microcomputer Managers Association

MMC Matched Memory Cycle + Microcomputer Marketing Council +

Microsoft Management Console [Microsoft]

MMCD MultiMedia Compact Disk

MMCX Multimedia Communication Exchange [Lucent Technologies]

MMI Man-Machine Interface

MMIS Materials Manager Information System

MMPM Multi Media Presentation Manager

MMU Memory Management Unit

MMVF Multimedia Video File [NEC]

MMX Matrix Manipulation Extensions [Intel] +

Multimedia Extensions

MNOS Metal Nitride Oxide Semiconductor

MNP Microcom Networking Protocol [Microcom]

.MNU Menu (fine name extension)

MO Magneto-Optical (disk drive)

MOB Memory-Order Buffer

MOBO Mother Board


MOD Module + Modulus

MODEM Modulator Demodulator

MOHLL Machine Oriented High Level Language

MOLAP Multidimensional On-Line Analytical Processing

MOM Manufacturing Operations Management +

Message-Oriented Middleware +

Microsoft Office Manager [Microsoft]

MONET Multiwavelength Optical Networking

MONO Monaural

MOO MUD, Object Oriented [Internet]

MOP Maintenance Operations Protocol

MOPS Million Operations Per Second

MOS Magneto-Optic Storage + Mean Opinion Score +

Metal Oxide Semiconductor

MOSFET Metal Oxide Semiconductor Field Effect Transistor

MOTD Message Of The Day

MOV Metal Oxide Varistor + Move

MOVS Move String

MP Massively Parallel (processing) + Multiple Processors

MPC Multimedia Personal Computer + Multipath Channel

MPCS Mission Planning and Control Station (Software)

MPE Multiple Programming Executive [HP]

MPEG Motion Picture Experts Group

MPI Message Passing Interface + Multiprecision Integer

MPM Message Passing Library [IBM]

MPMD Multiple Processor/Multiple Data

MPOA Multi-Protocol over Asynchronous-Transfer-Mode

MPP Massively Parallel Processing +

Message Posting Protocol + Message Processing Program

MPQP Multi-Protocol Quad Port [IBM]

MPR Multipart Repeater + Multi Protocol Router [Novell]

MPS Multiprocessor Specification

MPTN Multi-Protocol Transport Network


MPTS Multi-Protocol Transport Services

MPU Microprocessor Unit

MQI Message Queue Interface

MR Magneto Resistive + Modem Ready

MRCF Microsoft Realtime Compression Format

MRCI Microsoft Realtime Compression Interface

MRI Magnetic Resonance Imaging

MRM Most Recently-Used Master

MRO Multi-Region Operation

MRP Materials Requirement Planning

MRPL Main Ring Path Length

MRS Media Recognition System

MRT Mean Repair Time

MRU Maximum Receive Unit

MS Memory System + Message Store + Microsecond +

Microsoft Corporation + Millisecond

MSACM Microsoft Audio Compression Manager [Microsoft]

MSAU Multi-Station Access Unit

MSAV Microsoft Anti Virus [Microsoft]

MSB Most Significant Bit

MSBF Mean Swaps Between Failures

MSCDEX Microsoft Compact Disc Extensions [Microsoft]

MSCHAP Microsoft Challenge Handshake Authentication

Protocol [Microsoft]

MSD Mass Storage Device + Most Significant Digit +

Microsoft System Diagnostics [Microsoft]

MSDN Microsoft Developer Network [Microsoft]

MS-DOS Microsoft - Disk Operating System [Microsoft]

MSDR Multiplexed Streaming Data Request

MSDS Microsoft Developer Support [Microsoft]

MSFR Minimum Security Function Requirements [IBM]

MSG Message

.MSG Program Message (file name extension)

MSI Medium Scale Integration

MSIE Microsoft Internet Explorer [Microsoft]

MSL Map Specification Library + Mirrored Server Link

MSMQ Microsoft Message Queue-Server [Microsoft]

MSN Microsoft Network [Microsoft]

MSO Multiple-Systems Operator

.MSP Microsoft Paint (file name extension) [Microsoft]

MSRP Manufacturer Suggested Retail Price

MSS Mass Storage System +

Multiprotocol Switched Services [IBM]

MSTS Microsoft Terminal Server [Microsoft]

MSW Machine Status Word

MTA Message Transfer Agent + Multiple Terminal Access

MTBB Mean Time Between Breakdowns

MTBF Mean Time Between Failures

MTBJ Mean Time Between Jams

MTF Microsoft Tape Format [Microsoft] +

Modulation Transfer Function

MTRP Maximum Transfer Rate Performance

MTS Message Transfer Service/System +

Microsoft Transaction Server [Microsoft] +

Multichannel Television Sound

MTT Multi-Transaction Timer

MTTD Mean Time To Diagnose

MTTF Mean Time To Failure

MTTR Mean Time To Repair

MTU Maximum Transmission Unit

MUA Mail User Agent

MUD Multi-User Dialogue/Dimension/Domain/Dungeon [Internet]

MUL Multiply

MULTICS Multiplexed Information and Computing Service

MUMPS Massachusetts General Hospital Utility

Multi-Programming System (Programming Language)

MUSE Multi-User Shared Environment

MUT Monitor Under Test

MUX Multiplexer

MV Millivolt

MVB Multimedia Viewer Book


MVC Multimedia Viewer Compiler

MVDM Multiple Virtual DOS Machines

MVGA Monochrome Video Graphics Array

MVIP Multi-Vendor Integration Protocol

MVP Multimedia Video Processor

MVS Multiple Virtual Storage

MVT Multiprogramming with a Variable number of Tasks

MX Mail Exchanger [Internet]

MXS Microsoft Exchange Server [Microsoft]

MZR Multiple Zone Recording

NAC Network Adapter Card

NACD National Association of Computer Dealers

NACS National Advisory Committee on Semiconductors

NAE Not Above or Equal

NAK Negative Acknowledgment

NAM Number Assignment Module

NAMPS Narrow-Band Analog Mobile Phone Service [Motorola]

NAND Not And

NANO One thousand-millionth

NAP Network Access Point

NAPLPS North American Presentation Level Protocol

Syntax (graphics)

NAS Network Access Server + Network Application Support [DEC]

NASA National Aeronautics and Space Administration

NASDAQ National Association of Securities Dealers

Automatic Quotation

NASI NetWare Asynchronous Services Interface [Novell]

NASIRC NASA Automated Systems Internet Response Capability

NASKER NASA Ames Kernel (benchmark)

NAT Network Address Translators

NAU Network Addressable Unit

NAWS Negotiate About Window Size

NBE Not Below or Equal

NBI Nothing But Initials

NBS Narrowband Socket + National Bureau of Standards +

Numeric Backspace


NC Network Computer + No Carry + Numerical Control

NCA Network Communications Adapter +

Network Computing Architecture [Oracle]

NCC Network Control Center

NCD Network Computing Device

.NCF Netware Command File [Novell]

NCGA National Computer Graphics Association

NCIC National Crime Information Center

NCMT * Numerical Control for Machine Tools

NCOS Network Computer Operating System

NCP NetWare Core Protocol + Not Copy Protected +

Network Control Processor/Program/Protocol

NCR National Cash Register (Company)

NCSA National Center for Supercomputing Applications

NCSC National Computer Security Center

NCSI Network Communications Services

Interface [Network Products Corp.]

NDB Non-Directional Beacon

NDDK Network Device Development Kid [Microsoft]

NDEF Not to be Defined

NDIS Network Device/Driver Interface Specification

NDL Network Data Language

NDN Non-Delivery Notice

NDP Numeric Data Processor

NDR Network Data Representation

NDRO Non-Destructive Read Out

NDS NetWare Directory Service [Novell]

.NDX Index (file name extension)

NEC Nippon Electric Company

NED NASA Extragalactic Database [NASA]

NEG Negative + Negate

NEMA National Electrical Manufacturers Association

NEP Network Entry Point

NES National Education Supercomputer

NEST Novell Embedded Systems Technology [Novell]


.NET Networks (Domain Name) [Internet]

NetBIOS Network Basic Input/Output System [IBM]

NetBEUI NetBIOS Extended User Interface [IBM]

NETMON Network Monitor

.NEW New Information (file name extension)

NEWS NetWare Early Warning System [Frye Computer] +

Network Extensible Window System

NEWS. Current events [USENET Newsgroup Category]

NEXT Near-End Crosstalk

NFF No Fault Found

NFS Network File System [Sun]

NG No Good

NGE Not Greater or Equal

NGI Next-Generation Internet

NHC National Hurricane Center

NHR National Handwriting Recognition

NHRP Next Hop Resolution Protocol

N/I Non-Interlaced

NIA Next Instruction Address

NIC Network Information Center [Internet] +

Network Interface Card +

Numeric Intensive Computing

NICAD Nickel-Cadmium

NICOLAS Network Information Center OnLine Aid System [NASA]

NID New Interactive Display [NEC] + Next ID

NII National Information Infrastructure

NIM Network Installation Management [IBM]

NIMH Nickel-Metal Hydride

NIO Native Input/Output

NIPS Network I/Os Per Second

NIR Network Information Retrieval

NIS Network Information Service [Unix]

N-ISDN Narrowband ISDN + National ISDN

NISO National Information Standards Organization

NISP Networked Information Services Project

NIST National Institute for Standards and Technology


NITC National Information Technology Center

NIU Network Interface Unit

NJE Network Job Entry (protocol) [IBM]

NL New Line

NLE Not Less or Equal

NLM NetWare Loadable Module [Netware]

NLP Natural-Language Processing

NLQ Near Letter Quality

NLSFUNC National Language Support Function

NLV National Language Version [IBM]

NMI Non-Maskable Interrupt

NMM NetWare Management Map [NetWare]

NMOS Negative Channel Metal-Oxide Semiconductor

NMP Network Management Protocol [AT&T]

NMS Network Management System [Novell]

NN Network Node + No News [Internet]

NNI Network to Network Interface

NNM Network Node Manager

NNTP Network News Transfer Protocol [Internet]

NOC Network Operations Center

.NOM Individual with Personal Site (Domain Name) [Internet]

NOP No Operation

NOPAC Network OPAC

NOR Not Or

NOS Network Operating System

NPA Network Printer Alliance + Numbering Plan Area

NPI Network Printer Interface

NPL Nonprocedural Language

NPS Novell Productivity Specialist [Novell]

NPTN National Public Telecomputing Network

NPU Natural Processing Unit

NPX Numeric Processor Extension

NQS Network Queuing System [Cray]

NRC National Research Council (Canada)

NREN National Research and Education Network

NRM Network Resource Manager


NRZ Not Return to Zero

NRZI Non Return to Zero Inverted

NS Nanosecond (one-billionth of a second) +

National Semiconductor (as in Ns16550 UART) +

Network Supervisor + Non Stop

NSAP Network Service Access Point

NSAPI Netscape Server API [Netscape]

NSA POLY National Security Agency Polygraph

NSERC National Sciences and Engineering Research Council

(Canada)

NSF National Science Foundation

NSFNET National Science Foundation Network

NSI NASA Science Internet

NSLOOKUP Name Server Lookup [Unix]

NSM Netscape Server Manager [Netscape]

NSP Native Signal Processing [Intel] + Network Service




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