| Meaning | Category |
| Save the Children In Uganda | Community->Non-Profit Organizations |
| Sea Containers, LTD | Regional->Railroads |
| Selector Control Interface Test | Governmental->NASA |
| Serious Crimes Investigation Unit | Governmental->Police |
| Space Interface Unit | Governmental->NASA |
| Spinal Cord Injury Unit | Medical->Hospitals |
| Synchronous Clock Insertion Unit | Computing->Networking |
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