EM, Em or em may refer to:
Arts and entertainment
Music
* EM, the
E major
E major (or the key of E) is a major scale based on E, consisting of the pitches E, F, G, A, B, C, and D. Its key signature has four sharps. Its relative minor is C-sharp minor and its parallel minor is E minor. Its enharmonic equivalent, ...
musical scale
* Em, the
E minor musical scale
*
Electronic music, music that employs electronic musical instruments and electronic music technology in its production
*
Encyclopedia Metallum, an online metal music database
*
Eminem
Marshall Bruce Mathers III (born October 17, 1972), known professionally as Eminem (; often stylized as EMINƎM), is an American rapper and record producer. He is credited with popularizing hip hop in middle America and is critically acclai ...
, American rapper
Other uses in arts and entertainment
*
''Em'' (comic strip), a comic strip by Maria Smedstad
Companies and organizations
*
European Movement, an international lobbying association
*
Aero Benin (IATA code), a defunct airline
*
Empire Airlines (IATA code), a charter and cargo airline based in Idaho, US
*
Erasmus Mundus, an international student-exchange program
*
ExxonMobil
ExxonMobil Corporation (commonly shortened to Exxon) is an American multinational oil and gas corporation headquartered in Irving, Texas. It is the largest direct descendant of John D. Rockefeller's Standard Oil, and was formed on November 30, ...
, a large oil company formed from the merger of Exxon and Mobil in 1999
*
La République En Marche!
Renaissance (RE), previously known as La République En Marche ! (frequently abbreviated LREM, LaREM or REM; translated as "The Republic on the Move" or "Republic Forward"), or sometimes called simply En Marche ! () as its original name, is a l ...
(sometimes shortened to "En Marche!"), a major French political party
Economics
*
Emerging markets, nations undergoing rapid industrialization
Language and typography
Language
*
M, a letter of the modern Latin alphabet, in English and other languages
*
Em (Cyrillic) (М / м), a letter of the Cyrillic alphabet
*
Em (digraph), a digraph in Portuguese
* Em, the third-person singular oblique
Spivak pronoun
Typography
*
em (typography), a unit of measurement
*
em dash
The dash is a punctuation mark consisting of a long horizontal line. It is similar in appearance to the hyphen but is longer and sometimes higher from the baseline. The most common versions are the endash , generally longer than the hyphen b ...
, a dash that is one em wide
*
em space or mutton, a space that is one em wide
Management
*
Emergency management
Emergency management or disaster management is the managerial function charged with creating the framework within which communities reduce vulnerability to hazards and cope with disasters. Emergency management, despite its name, does not actuall ...
, a discipline that studies dealing with and avoiding risks
*
Energy management, planning and operation of energy production and energy consumption units
*
Environmental management
Environmental resource management is the management of the interaction and impact of human societies on the environment. It is not, as the phrase might suggest, the management of the environment itself. Environmental resources management aims ...
, the management of the interaction of human societies with the environment
Places
*
El Monte, California, a city in the United States
*
El Monte, Chile, a city in Chile
Science
Biology
*
Effective microorganisms, a series of products intended to improve soil quality and plant growth
*
Extracellular matrix, the connective tissue supporting cells in multicellular organisms
*
Membrane potential
Membrane potential (also transmembrane potential or membrane voltage) is the difference in electric potential between the interior and the exterior of a biological cell. That is, there is a difference in the energy required for electric charges ...
(''E''
m), of a cell
Computing
* , emphasis
HTML element
An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). The first used version of HTML was written by Tim Berners-Lee in 1993 ...
*
End of medium, ISO C0 control code ^Y
*
Empirical modelling
*
em (typography), a unit of measurement in Web design
*
eM Client E-Mail client
Medicine
*
Emergency medicine
Emergency medicine is the medical speciality concerned with the care of illnesses or injuries requiring immediate medical attention. Emergency physicians (often called “ER doctors” in the United States) continuously learn to care for unsche ...
, a medical specialty dealing with acute illnesses and injuries that require immediate attention
*
Erythema multiforme, a skin condition that usually follows an antecedent infection or drug exposure
*
Erythromelalgia, a disorder that typically affects the skin of the feet and/or hands, causing redness, heat and pain
*
Extensive metabolizer, a term used in pharmacogenomics to refer to individuals with normal metabolic activity
Physics
*
Exametre or exameter (Em), an SI unit of length equal to 10
18 metres
*
Electromagnetic spectrum, the range of all possible frequencies of electromagnetic radiation
*
Electromigration
Electromigration is the transport of material caused by the gradual movement of the ions in a conductor due to the momentum transfer between conducting electrons and diffusing metal atoms. The effect is important in applications where high direc ...
, the transport of conducting solid material caused by electric current through it
*
Electromagnetism, one of the fundamental physical forces
*
Electromechanics, combines electrical engineering and mechanical engineering
Other uses in science and technology
*
Nikon EM, an SLR camera made by the Nikon Corporation in the late 1970s
*
Electron microscope, a type of microscope that uses electrons to "illuminate" a specimen and create an enlarged image
*
Electron multiplier, a vacuum-tube structure that multiplies incident charges by means of secondary emission
*
Atlantic Equatorial mode
The Atlantic Equatorial Mode or Atlantic Niño is a quasiperiodic interannual climate pattern of the equatorial Atlantic Ocean. It is the dominant mode of year-to-year variability that results in alternating warming and cooling episodes of sea su ...
, a climate pattern of the Atlantic Ocean
*
Expectation–maximization algorithm, an algorithm for finding maximum likelihood estimates of parameters in probabilistic models
Other uses
*
Electrician's mate, an occupational rating in the U.S. Navy and U.S. Coast Guard
*
David Em (born 1952), an American computer art pioneer
*
EM gauge, a scale used in model railways
* ''
Etymologicum Magnum'', in the bibliography of the largest Byzantine lexicon
{{disambiguation