SDI
# SDI

SDI may refer to:

## Arts and entertainment

* SDI (arcade game), 1987, by Sega
* S.D.I. (video game), 1986, by Cinemaware

## Companies and organizations

* Samsung SDI, battery manufacturer
* Scottish Development International
* Scuba Diving International
* SDI Media Group, providing subtitling and language services
* SDI Presence, US IT consultancy
* SDI Technologies, a consumer electronics manufacturer, New Jersey, U.S.A.
* Service Desk Institute, for computer help desk staff
* Slum Dwellers International
* Socialisti Democratici Italiani (Italian Democratic Socialists), a political party
* Software Design Inc.
* Spiritual Directors International, supporting spiritual direction
* Steel Dynamics, Inc., a steel producer, Indiana, US.A.

## In science and technology

### Computing and telecommunications

* Serial data input in the Serial Peripheral Interface bus
* Serial digital interface for sending video signals over coaxial cable
* Single document interface, a style of graphical user interface
* Software-defined infrastructure, with no human intervention
* Spatial data infrastructure
* Standard Disk Interconnect, a DEC standard
* Statistical Design Institute's SDI Tools for Microsoft Excel
* System Deployment Image, a Microsoft disk image file format

### Medicine

* Sulfadimidine, an antibiotic

### Other uses in science and technology

* Selective dissemination of information
* Silt density index in reverse osmosis systems
* Smoke-developed index, the concentration of smoke emitted by a material
* Spiral Dynamics Integral, a model of evolutionary development
* Stand density index, of the stocking of a stand of trees
* Subsurface drip irrigation
* Suction Diesel Injection, a Volkswagen diesel engine

## Other uses

* Saidor Airport (IATA code), in Madang Province, Papua New Guinea
* Socio-Demographic Index of the Global Burden of Disease Study
* State Disability Insurance of California, US
* Strategic Defense Initiative, US anti-missile project
