GSI

GSI may refer to:

Science and technology

Geotechnical seismic isolation Geological Strength Index Gonadosomatic Index UK Government Secure Intranet Grid Security Infrastructure, a computer networking specification "Global Systems Integrator", large managed technology services providers GS-I (Cellulose synthase (UDP-forming)), an enzyme Great Sea Interconnector

Businesses and organizations Businesses Gemological Science International, gemstone identification/grading/appraisal services Geophysical Service Incorporated, an American petroleum exploration corporation Guangzhou Shipyard International, a Chinese state-owned shipbuilder GSI Commerce, now eBay Enterprise, an American e-commerce company

Scientific organizations GSI Helmholtz Centre for Heavy Ion Research, Germany Geographical Society of Ireland Geospatial Information Authority of Japan Geological Society of India Geological Survey of India Geological Survey of Ireland

Other organizations Global Security Initiative Gabinete de Segurança Institucional da Presidência da República (Institutional Security Bureau), Brazil Gustav Stresemann Institute, a German educational charity

Other uses Graduate student instructor, a teaching fellow at some US universities Grand-Santi Airport, French Guiana (IATA code GSI)

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