| Abbreviation | Definition |
|---|---|
| SIGMA | System For Integrated Generalised Modelling Analysis |
| SII | Strengths, Improvements, And Insights |
| SIIRD | Singapore-Israel Industrial R&D Foundation |
| SIIRD | Singapore-Israel Industrial RD Foundation |
| SIM | Service Improvement Management |
| SIM | Strategic Instruction Model |
| SIM | Structured Information Management |
| SIN | Service Industry Night |
| SINAC | Sistema Integral de Negociacion Astra per Computador |
| SIOP | Sales Inventory and Operations Plan |
| SIOPEL | SIstema de OPeraciones ELectrónicas (Electronic Transaction System) |
| SIP | Sale In Progress |
| SIP | Submission Information Package |
| SIPA | Securities Investor Protection Act |
| SIPDE | Search Identify Predict Decide And Execute |
| SIPFI | Securities Investors Protection Fund, Inc. |
| SIPOC | Supplier-Input-Process-Output-Customer |
| SIR | Scientific Information Retrieval |
| SIR | Self-Insured Retention |
| SIR | Standardized Incidence Ratios |