English abbreviations from sift to sii
- SIFT (Scheduled Intentional Focused Time)
- SIG (Schweizerische Industrie Gesellschaft (German, "Swiss Industry Company"). See also SIG Sauer, a firearms manufacturer spun off from the aforementioned company in 2000.)
- Sig. (Sigillum ("Seal"))
- SIGACTS (significant activities)
- SIGADA (Special Interest Group for ADA)
- SIGC2 (Signal Command and Control)
- SIGCAT (Special Interest Group on CD-ROM Applications and Technology)
- SIGCAT — (a) Special Interest Group for CD (ROM Applications and Technology)
- SIGCEN (Signal Center)
- SIGCHI (Special Interest Group on Computer-Human Interaction)
- SIGCSE (Special Interest Group of Computer Science Education)
- SiGe (Silicon Germanium)
- SIGGRAPH (Special Interest Group on Graphics)
- SIGI (System Of Interactive Guidance And Information)
- SIGINT (Signals Intelligence)
- SIGIR (Special Inspector General for Iraq Reconstruction)
- SIGMET (Significant meteorological advisory)
- SIGN (Scottish Intercollegiate Guidelines Network (similar to the English NICE))
- SIGNAL (Statistical Indicators Of Growth, Navigation, Alignment, And Learning)
- SIGSEC (Signal Security)
- SIGTRS (Special Interest Group on Text Retrieval Systems)
- SIGTTO (Society of International Gas Tanker and Terminal Operators)
- SiH (Silicone hydrogel)
- SIH4 (Silane)
- SII (Sania Ramel Airport)