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EM, Em or em has several meanings:
Computing
- emphasis (typography), or
<em>, the HTML element for emphasis - Expectation-maximization algorithm, used for statistical computing
Scientific
- Effective Microorganisms or EM-Technology by Dr. Teruo Higa
- Electromagnetic
- Electromagnetism (diamagnetism) as compared to ferromagnetism (paramagnetism)
- Electromigration - A common issue encountered in integrated circuit design
- Electron microscope
- Electron multiplier
- Exametre (symbol Em), an SI unit of length (equal to 1018 metres)
- "end of medium" control code in the C0 control code set
Typography & orthography
- em (typography), a unit of measure used in orthography, typography, and also Cascading Style Sheets (CSS). The em space is one em wide.
- The em dash (—), which is one em wide.
- Em (Cyrillic), A phoneme of the Cyrillic alphabet. It corresponds directly to the Latin alphabet letter 'M' and is pronounced similarly.
- An em is the square of the typeface or font that is being used. For example, a 14 point EM has a 14 point square, 24 point EM a 24 point square
Social
- An enlisted Man of the United States Army.
- One of the Spivak pronouns.
- A common slang for "them", e.g. "go get 'em, tiger!"
- EM, Reuters Instrument Code for the 1-month LIBOR futures contracts at the Chicago Mercantile Exchange.
- The common short form of some given names, e.g. 'Emma', 'Emily', 'Emmett', 'Emmanuel', and 'Emerson'.
- Common abbreviation for electronic music.
- Common abbreviation for emerging markets.
Music
- EM and Em are abbreviations for the E Major and E Minor chords, respectively.
- E minor scale
- Eminem, a rapper
- Extraordinary Machine, a Fiona Apple album
Other
- The European Movement
- The IATA code for Aero Benin
- The IATA code for Empire Airlines
- Emergency management
- Extreme Makeover
- The model railway EM gauge (Eighteen Millimetres)
- NZR EM class series of Electric Multiple Units purchased by the New Zealand Railways Department.
- Emergency medicine
