SIS
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The initials SIS may stand for:
- Swedish Standards Institute (earlier named Standardiseringskommissionen i Sverige).
- Schengen Information System
- Secret Intelligence Service (MI6, a British intelligence agency).
- Security Intelligence Service (either a Canadian or a New Zealand intelligence agency)
- Signals Intelligence Service This United States Army group, led by William F. Friedman, broke the Japanese Foreign Office cypher called Purple. It eventually became a part of the NSA.
- Strategic information system An information system to support enterprises' strategy.
- Single Instance Store A system for coalescing identical object instances to save space.
- Silicon Integrated Systems
- Slovenska informacna sluzba (Slovak Intelligence Service)
- Special Intelligence Service A secret FBI intelligenge agency operating in South America during World War Two.
- SIS is the filename suffix for executable files for the Symbian OS operating system