• Searl Effect Generator, an alleged free energy device
• Special Effects Generator, used in a television studio
  Television studio
  A television studio is an installation in which a video productions take place, either for the recording of live television to video tape, or for the acquisition of raw footage for post-production. The design of a studio is similar to, and derived from, movie studios, with a few amendments for the...
  
  
• Society of Exploration Geophysicists
  Society of Exploration Geophysicists
  The Society of Exploration Geophysicists is a nonprofit organization dedicated to promoting the science of geophysics and the education of exploration geophysicists. The Society fosters the expert and ethical practice of geophysics in the exploration and development of natural resources, in...
  
  
• Society of Economic Geologists
  Society of Economic Geologists
  The Society of Economic Geologists originated from a 1919 gathering of a group of Geological Society of America members who were especially interested in economic geology. The Society was established on December 28, 1920, during a constituting meeting of 60 distinguished professionals...
  
  
• Semaphore Entertainment Group, a pay-per-view company which co-founded the Ultimate Fighting Championship
  Ultimate Fighting Championship
  The Ultimate Fighting Championship is the largest mixed martial arts promotion company in the world that hosts most of the top-ranked fighters in the sport...
  
  
• Similar Exposure Group, used in Occupational Hygiene
  Occupational hygiene
  Occupational hygiene is generally defined as the art and science dedicated to the anticipation, recognition, evaluation, communication and control of environmental stressors in, or arising from, the workplace that may result in injury, illness, impairment, or affect the well being of workers and...
  
  

• Soft Elastic Gelatin, in pharmacology
• Special Escort Group (Metropolitan Police)
  Special Escort Group (Metropolitan Police)
  The Special Escort Group is a Specialist Operations unit within London's Metropolitan Police Service.-Role:The unit's purpose is to provide armed motorcycle escorts for members of the Royal family, protected members of the Government, visiting royals, heads of state and other visiting dignitaries...
  
  , escort important persons, valuable or hazardous cargoes in London, England
• Special Escort Group (Ministry of Defence Police)
  Special Escort Group (Ministry of Defence Police)
  The Special Escort Group or SEG are a specialised unit of the Ministry of Defence Police. It is primarily responsible for the movement of all Nuclear Weapons and Defence Special Nuclear Material within the United Kingdom....
  
  , protects nuclear materials in transit between United Kingdom military establishments
• Supplementum Epigraphicum Graecum
  Supplementum Epigraphicum Graecum
  Supplementum Epigraphicum Graecum is an annual publication collecting bibliography and summaries of Greek inscriptions published in the previous year; new inscriptions have full Greek text and critical apparatus...
  
  , an annual publication of new ancient Greek inscriptions
• Select Employee Group, a group of people eligible for credit union
  Credit union
  A credit union is a cooperative financial institution that is owned and controlled by its members and operated for the purpose of promoting thrift, providing credit at competitive rates, and providing other financial services to its members...
  
   membership
• Selective Epitaxial Growth

Other abbreviations and uses

• Second
  Second
  The second is a unit of measurement of time, and is the International System of Units base unit of time. It may be measured using a clock....
  
  s, in Spanish
• "Him/herself
  Self (philosophy)
  The philosophy of self defines the essential qualities that make one person distinct from all others. There have been numerous approaches to defining these qualities. The self is the idea of a unified being which is the source of consciousness. Moreover, this self is the agent responsible for the...
  
  ", in Norwegian
  Norwegian language
  Norwegian is a North Germanic language spoken primarily in Norway, where it is the official language. Together with Swedish and Danish, Norwegian forms a continuum of more or less mutually intelligible local and regional variants .These Scandinavian languages together with the Faroese language...
  
  , approximate equivalent
• , an XML
  XML
  Extensible Markup Language is a set of rules for encoding documents in machine-readable form. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all gratis open standards....
  
   element in several languages representing an arbitrary segment
• Seg, a Swedish
  Swedish language
  Swedish is a North Germanic language, spoken by approximately 10 million people, predominantly in Sweden and parts of Finland, especially along its coast and on the Åland islands. It is largely mutually intelligible with Norwegian and Danish...
  
   spoken word for someone or something that is very slow and/or retarded
  Mental retardation
  Mental retardation is a generalized disorder appearing before adulthood, characterized by significantly impaired cognitive functioning and deficits in two or more adaptive behaviors...