SEM or Sem can refer to:

Computing

  • Search engine marketing, promoting websites by increasing their visibility in search engine results
  • Security event manager, a security log tool used on data networks

Economics and management

  • Stock Exchange of Mauritius, the principal stock exchange of the island country of Mauritius
  • Strategic enrollment management, an element of planning for new growth at a university or college
  • Samsung Electro-Mechanics, a South Korean company

Energy

  • Single Electricity Market, the integration of the electricity sectors of the Republic of Ireland and Northern Ireland in a single market
  • Strategic energy management, continuous improvement process for energy efficiency based on behavioral change

Mathematics and statistics

  • Structural equation modeling, in data analysis
  • Simultaneous equations model, in econometrics
  • Standard error of the mean in statistics

Places

  • Craig Field (Alabama) (IATA code: SEM), a public airport four miles southeast of Selma, in Dallas County, Alabama
  • Sem, Ariège, a former commune in the Ariège department in southwestern France
  • Sem, Norway, a village in Tønsberg Municipality in Vestfold county, Norway
  • Sem Municipality, a former municipality in Vestfold county, Norway

Science and technology

  • Scanning electron microscope
  • Space Experiment Module, of the Freestar experiment on space shuttle Columbia
  • Sistema Eléctrico de Magallanes, an electrical power grid of Chile
  • SEM, instrument (seismometer) of the Surface Science Platform (Kazachok) mission ExoMars 2022
  • A protecting group in organic chemistry, see 2-(trimethylsilyl)ethoxymethyl chloride (SEM-Cl)

Schools, organisations, societies

  • Society for Experimental Mechanics, an engineering professional organization.
  • The School of Ecclesiastic Music the school of Byzantine Music in Mount Lebanon
  • Swedish Evangelical Mission
  • Society for Ethnomusicology, an ethnomusicology in Indiana, US
  • Science and Engineering Magnet, a school in Dallas, Texas, US
  • S.E.M. Group civil engineering company based in South Australia
  • Steam Engine Makers' Society, early British trade union
  • Shandong Engineering Machinery, owned by Caterpillar Inc.
  • State Secretariat for Migration (Switzerland)

People

  • Shem or Sem, one of the sons of Noah, as depicted in the Bible
  • Sem (given name), a usually masculine first name
  • Sem (artist) (1863–1934), French caricaturist
  • Elise Sem (1870–1950), Norwegian barrister, women's activist, and sports official
  • Ingebjørg Dahl Sem (born 1938), Norwegian Christian writer
  • Ingebjørg Sem (1931–2009), Norwegian actress
  • John Sem (born 1973), Papua New Guinean Olympic boxer
  • Niels Arntzen Sem (1782–1859), Norwegian politician
  • Suy Sem (born 1947), Cambodian politician

Other

  • Super Étendard Modernisé, a French fighter aircraft
  • Self-evaluation maintenance theory, a psychological theory of self
  • Synthesizer Expansion Module, an Oberheim synthesizer
  • New Austrian tunnelling method or Sequential Excavation Method
  • Sports and exercise medicine