MD

MD, Md, mD or md may refer to:

MD, Md, mD, or .md commonly refers to a Markdown file in software development. A .md file is a plain text document written using Markdown syntax (like # Heading). It’s often used for README files and can be converted into HTML, PDF, or other formats using online tools such as Toflio.
Places
 Moldova (ISO country code MD)
 Maryland (United States postal abbreviation MD)
 Magdeburg (vehicle plate prefix MD), a city in Germany
 Mödling District (vehicle plate prefix MD), in Lower Austria, Austria

People
 Major Douglas (1879–1952), British Engineer and pioneer of the Social Credit economic reform movement
 Muhammad (name) or Mohammed (Md)

Arts, entertainment, and media
Music
  or  (MD or m.d.), used in piano scores to mark sequences of notes that are to be played with the right hand
 MiniDisc, an optical storage medium developed by Sony
 Music director; the term "MD" is used particularly in musical theatre

Other arts, entertainment, and media
 MDs (TV series), a 2002 made-for-television medical drama
 , ("Materials and discussions for the analysis of classical texts"), an Italian classics journal
 Mega Drive, a game console produced by Sega

Brands and enterprises
 Air Madagascar (IATA airline code MD)
 McDonnell Douglas (aircraft model prefix MD), a former aerospace manufacturer that later merged with Boeing

Science and technology
Biology and medicine
 Doctor of Medicine (MD), from the Latin 
 Medial dorsal nucleus, a large nucleus in the thalamus
 Muscular dystrophy, a genetic and hereditary muscle disease
 MD (Ayurveda), a degree in the Indian medical system of Ayurveda

Computing
 .md, Internet top-level domain for Moldova
 Markdown (file extension .md), a format
 mdadm (multiple device), a device driver used to support RAID in the Linux kernel
 Message-digest algorithm, a cryptographic hashing function
 Microdrive, a type of miniature hard drive
 mkdir or md, an operating system command to create a directory

Other uses in science and technology
 Mean absolute difference, a measure of statistical dispersion
 Mendelevium (Md), a chemical element
 Mesoscale discussion, a short-term technical meteorological forecast concerning convection; See Storm Prediction Center or Weather Prediction Center
 Methyldichloroarsine, a blister agent used in chemical warfare
 Millidarcy (mD), a unit of fluid permeability
 Molecular dynamics, a method of computer simulation of molecular interaction
 Membrane distillation, a process of membrane filtration
 Earthquake duration magnitude ()

Other uses
 MD, 1500 in Roman numerals
 Majority decision, a winning criterion in several full-contact combat sports
 Man-day, amount of work performed by the average worker in one day
 Managing director, a chief executive
 Marque déposée (MD), an international trademarking symbol in countries where French is the dominant language; See Unicode subscripts and superscripts
 Match Director (MD), person who handles the overall match administration before, after and during an International Practical Shooting Confederation match
 Memorial Day

Related pages
 Medium (disambiguation)