| SSSI | Safety and Security Services Inc 
| Others |
| SSSI | Scientific Systems and Software International
| Others |
| SSSI | Sikorsky Support Services Inc
| Others |
| SSSI | Site Of Special Scientific Interest
| Others |
| SSSI | Site of Special Scientific Interest (!)
| Others |
| SSSI | Sites Of Special Scientific Interest
| Others |
| SSSI | Society for the Study of Symbolic Interaction
| Others |
| SSSI | Solid State Storage Initiative
| Others |
| SSSI | Someone Special Says Interesting
| Others |
| SSSI | Sssisite Of Special Scientific Interest
| Others |
| SSSI | Storage Solutions Specialists Inc
| Others |
| SSSI | Summer School on Socioeconomic Inequality
| Others |
| SSSI | Surveying Spatial Sciences Institute
| Others |