SDI
SDI stands for:
- SDI , IATA code for the airport in Saidor , Papua New Guinea
- Scuba Diving International , a diving association
- Socialisti Democratici Italiani , Italy's social democratic party
- Languages & Interpreter Institute Munich , a specialist academy and vocational school
- Strategic Defense Initiative , a space-based missile defense system from the 1980s announced by US President Ronald Reagan
- System-dynamic intervention , a model for family constellations
Technology:
- Suction diesel with direct injection , see suction diesel , designation at Volkswagen for this design
- Selective Dissemination of Information , an automatic profile service for permanent monitoring of interesting information, see Alert Service
- Serial Digital Interface , an interface for the serial transmission of digital audio and video data
- Silt Density Index , a scale for colloids present in water
- Single Document Interface , a special dialog application in graphical user interfaces
- Spatial data infrastructure , see spatial data infrastructure
- Stand Density Index , a stand density measure in forestry
SDI stands for:
- SDI , speed metal band from Osnabrück
