SDI

SDI is a three-letter abbreviation with multiple meanings, including:

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• Serial Digital Interface
• Single document interface
• Strategic Defense Initiative (U.S. anti-missile project under Ronald Reagan colloquially known as "Star Wars")
• Subsurface drip irrigation (also sometimes referred to as SSDI)

Less common expansions include:

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• S.D.I., a Cinemaware computer game and an arcade game
• Automotive fuel injection variants:
• Saab Direct Injection
• Semi-direct injection
• Solenoid direct injection
• Standard diesel injection
• Sales document item
• Saratoga Direct Inc.
• Sarawak Development Institute
• Scientific Development and Integration
• Scion Digital Imaging
• Scuba Diving International
• Selective Dissemination of Information
• Serial Data Input
• Serial Data Interface
• Service Dimensions Inc.
• Seoul Development Institute
• Socratic Dialogue Inducing Lab
• Software Development Institute
• Software Dynamics, Incorporated
• Southern Dental Industries Limited
• Space Science and Engineering Center (SSEC) Desktop Ingestor
• Spatial Data Infrastructure
• Spatial Data Integrations, Inc.
• Stamp Dealers International
• Spatial Development Initiatives
• State Disability Insurance, California, USA
• Statistics on Depository Institutions
• Steel Deck Institute
• Steel Dynamics Inc.
• Strategic Diagnostics Inc.
• Strategic Directions International
• Strategic Distribution, Inc.
• Strengthening Democratic Institutions Project
• Susila Dharma International Association, the social welfare "wing" of Subud
• Sustainable Development Indicators
• Sustainable Development Information
• Sustainable Development Initiative
• Systems by Design of Illinois
• Systems Documentation, Inc.
• S.D.I., a German speed metal band.