EM, Em or em may refer to:



  • 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






  • 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


  • 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


  • 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





  • 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