EM, Em or em can mean:

• Electromagnetism
• Electron microscope
• Exametre (10¹⁸ m)
• Expectation-maximization
• Enlisted man
• Em dash
• Em space
• Em, a unit of measurement used in typography.
• Effective
  Microorganisms
• a letter of the Cyrillic alphabet. It corresponds directly to
  the Latin letter M and is pronounced similarly.
• The letter M in the Latin
  alphabet.
• also one of the Spivak pronouns.
• a common slang for “them”.

via Wikipedia

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