EM

EM, Em or em may refer to:

Computing

• <em></em>, emphasis HTML element
• End of medium, ISO C0 control code ^Y
• Empirical modelling
• em (typography), a unit of measurement in Web design

Music

• E major (EM), a musical scale
• E minor (Em), a musical scale
• Electronic music, music that employs electronic musical instruments and electronic music technology in its production

Organizations

• European Movement, an international lobbying association
• Aero Benin (IATA code), a former airline
• Empire Airlines (IATA code), a charter and cargo airline based in Idaho, US

Science

• Atlantic Equatorial mode, a climate pattern of the Atlantic Ocean
• Expectation–maximization algorithm, an algorithm for finding maximum likelihood estimates of parameters in probabilistic models

Physics

• Exametre or exameter (Em), an SI unit of length equal to 10¹⁸ metres
• Electromagnetic spectrum, the range of all possible frequencies of electromagnetic radiation
• Electromigration, the transport of conducting solid material caused by electric current through it
• Electromagnetism, one of the fundamental physical forces

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 (E_m), of a cell

Medicine

• Emergency medicine, 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

Technology

• 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
• Nikon EM, an SLR camera made by the Nikon Corporation in the late 1970s

Linguistics

• 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, a dash that is one em wide
• em space or mutton, a space that is one em wide

Management

• Emergency management, a discipline that studies dealing with and avoiding risks
• Energy management, planning and operation of energy production and energy consumption units
• Environmental management, the management of the interaction of human societies with the environment

Places

• El Monte, California, Los Angeles County, California, US
• El Monte, Chile, Talagante Province, Santiago Metropolitan Region, Chile

People

• David Em (born 1952), American computer art pioneer

Other uses

• Em (comic strip), a comic strip by Maria Smedstad
• London Interbank Offered Rate, futures contracts, in Reuters Instrument Code for the 1-month at the Chicago Mercantile Exchange
• EM gauge, a scale used in model railways
• Emerging markets, a nation's social or business activity in the process of rapid industrialization
• Erasmus Mundus, an international student-exchange program
• Electrician's mate, an occupational rating in the U.S. Navy and U.S. Coast Guard
• Etymologicum Magnum, standard abbreviation in the bibliography of the largest Byzantine lexicon, the lexical encyclopaedia compiled at Constantinople around 1150 AD