SSI
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The initialism SSI can mean:
- Scuba Schools International, a diver training organization
- Server Side Includes for web servers
- Single Sign In, a concept in which access to multiple systems requires one set of credentials (ex: Microsoft's Active Directory)
- Single-system image, a cluster dedicated operating system
- Small Scale Integration electronic chips
- Space Studies Institute
- SSI, a San Francisco punk rock band
- Strategic Simulations, Inc., a software company producing simulation games
- Supplemental Security Income, a United States federal government program
- Subsecretaria de Inteligência, the Brazilian Agency Intelligence until 1995.
- Southern Software, Inc. a type foundry. (But in this case the initialism is, correctly, SSi.)