| Abbreviation | Definition |
|---|---|
| SIR | Supplemental Information Report |
| SIRA | Strategic Information Research Analysis |
| SIRT | Self-Imposed Red Tape |
| SIS | Sales Information System |
| SIS | Short Interval Scheduling |
| SIS | Steal Ideas Shamelessly |
| SISPQ | Safety, Integrity, Strength, Purity, and Quality |
| SIT | Scaffold Inspection and Testing |
| SIT | Staff In Training |
| SIT | Systematic Inventive Thinking |
| SITREL | Sistema de Transacciones Electrónico de applicación bursátil |
| SITUS | System for Institutional Trading of Unregistered Securities |
| SIU | Scheduling Information Unsolicited |
| SK | Scrap Killer |
| SK | Shop Kept |
| SK | Super Kiosk |
| SKILL | Service, Knowledge, Integrity, Literacy, and Linkages |
| SKU | Stock Keeping Unit |
| SL | Sold |
| SL | Sundara Laxmi |