SDI is a
three-letter abbreviation with many expansions. It's impossible to count exactly how many expansions it has, but it's surely one of candidates for the first place.
Less common expansions include:
- Saratoga Direct Inc.
- Sarawak Development Institute
- Schaumburg Dienstleistung für Informationstechnik
- Scientific Development and Integration
- Scuba Diving International
- Selective Dissemination of Information
- Serial Data Interface
- Service Dimensions Inc.
- Seoul Development Institute
- Socratic Dialogue Inducing Lab
- Software Dynamics, Incorporated
- Southern Dental Industries Limited
- Soluzioni d'Impresa
- Spatial Development Initiatives
- Space Science and Engineering Center (SSEC) Desktop Ingestor
- Spatial Data Infrastructure
- Spatial Data Integrations, Inc.
- Stamp Dealers International
- State Disability Insurance
- Statistics on Depository Institutions
- Steel Deck Institute
- Steel Dynamics Inc.
- Strategic Diagnostics Inc.
- Strategic Directions International
- Strengthening Democratic Institutions Project
- Sustainable Development Indicators
- Sustainable Development Information
- Sustainable Development Initiative
- Systems by Design of Illinois
- Systems Documentation, Inc.
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