SSI

SSI may refer to:

Economics

• Standing Settlement Instructions, payment processing and settlement information about financial institutions
• Strategic Sustainable Investing, an investment strategy that recognizes financial value in transitional leadership towards sustainability
• Supplemental Security Income, a United States federal government program
• Small Scale Industry, small-sized manufacturing firms. This phrase is primarily used in India.

Computing

• Server Side Includes, a server-side scripting language used on the Web
• Server System Infrastructure, design specifications for common server hardware elements (e.g. SSI CEB)
• Single Sign In, a specialized form of software authentication
• Single system image, a cluster dedicated operating system
• Small Scale Integration, electronic chips
• The Software Sustainability Institute, a UK-based, academic software organisation
• Static Single Information form, a variant of the Static Single Assignment intermediate format for compilers
• Strategic Simulations, Inc., a computer gaming company that produced war and simulation games from the mid 1980s to late 1990s.
• Synchronous Serial Interface, electronics
• Serial Peripheral Interface Bus, Often referred to as SSI (Synchronous Serial Interface)
• Stochastic Subspace Identification, algorithm to employ the output-only system identification technique (calculating resonance frequencies in real-time)
• Serializable snapshot isolation, a way to allow multiple concurrent transactions to see consistent information when making changes to a database

Medicine

• Sliding-Scale Insulin, a method of insulin administration
• Solid State Intelligence, a malevolent entity described by John C. Lilly
• Stress-strain index, a measure of bone strength
• Surgical site infection, this term is preferred over "Surgical Wound Infection"

Military and police

• Soldier Support Institute
• Selective Service Initiative, a form of military conscription in the United States
• Senior Station Inspector, a rank in the Singapore Police Force
• Serviciul Secret de Informaţii, the Romanian intelligence service in the interwar period (until November 1940)
• Serviciul Special de Informaţii, the Romanian intelligence service between November 1940 and September 1944
• Shoulder Sleeve Insignia (US Army), formation insignia used by the United States Army
• Staff Sergeant Instructor, an appointment in the British Army
• Subsecretaria de Inteligência, the Brazilian intelligence agency until 1995
• State Security Intelligence agency of Egypt

Organizations

• Saigon Securities Inc (SSI:VN) , a Vietnamese Investment Bank
• Samsung Semiconductor Inc., a Korean electronics company
• Scuba Schools International, a diver training organization
• SSI Shredding Systems, Inc., an industrial shredder company
• Sino Strategic International, a South East Asian and Australian investment holding company
• Southern Software, Inc. (SSi), a type foundry
• Space Services Inc., a team of companies investigating new commercial opportunities in space
• Space Studies Institute, an American non-profit organisation
• The Spastics Society of India, an organization based in India
• Spatial Sciences Institute, a professional body in the Asia-Pacific region
• Statens Serum Institut, the Danish State Serum Institute
• Strategic Studies Institute, the United States Army War College institute for geostrategic and national security research and analysis
• Sustainable Sciences Institute, a San Francisco-based organisation building local capacity in developing countries
• Statens strålskyddsinstitut (Swedish Radiation Safety Authority), a Stockholm-based regulatory and research government agency
• Survey Sampling International (SSI), a global provider of sampling solutions in marketing research
• Swedish Society for Interlingua, a society that encourages the active use of Interlingua in Sweden
• The General Directorate for State Security Investigations Egypt, 's internal security force

Transportation

• Sensitive Security Information, a designation used by the United States Transportation Security Administration (49 CFR part 1520) and the Department of Transportation (49 CFR part 15)
• Solid State Interlocking is the brand name of the first generation processor-based interlocking developed in the 1980s by British Rail, GEC-General Signal and Westinghouse Signals Ltd in the UK

Honorifics

• Star of the Solomon Islands, the most senior award made by the government of the Solomon Islands

Market research

• SSI Model, stands for Subject Matter Expertise, Site visits, Industry Consultations

Others

• Sustainable Society Index
• Single Sex Instruction