sort by Rank | Alpha
| Possible Meanings | Rank |
| Sleepless in the Saddle | *** |
| Soccer in the Streets | *** |
| Saganami Island Tactical Simulator | *** |
| Satellite Image Time Series | *** |
| Secure Information Technology Solutions | *** |
| Safe Implementation of Thrombolysis in Stroke | *** |
| Strategic Information Technology Services | *** |
| Self-Injury Trauma Scale | ** |
| syndrome of inappropriate thyrotropin secretion | ** |
| Springfield Infant Toddler Services | ** |
| stilbene isothiocyanate sulphonic acid | ** |
| Special Initiatives Tracking System | ** |
| Symposium on Intelligent Transportation Systems | ** |
| secondary injection test set | ** |
| Slovakia Incoming Travel Services | ** |
| 4-acetamido-4'-isothiocyanostilbene-2,2'-disulfonic acid | ** |
| Swire International Travel Services | ** |
| Systems Integration and Test | ** |
| Scientists and Innovators in the Schools | ** |
| Southeast Interpreting and Translation Services | ** |
| Scientists in the Schools | ** |
| Shell Int Trading Shipping | ** |
| System Integration and Test | ** |
| Senior Insurance Training Services | ** |
| 4-acetamido-4'-isothiocyano-2,2'-disulfonic stilbene | * |
| Summer Institute for Teachers of Spanish | * |
| System and Information Technology Support | * |
| Single Interconnect Tree Synthesis | * |
| Sailor in the Simulation | * |
| Special Investigation Test Schedule | * |
| Student Information Technology Services | * |
| Site Investigation Tracking System | * |
| SHIPBOARD INSTRUCTOR TRAINING AND SUPPORT | * |
| 4-acetamido-4'-isothiocyanostilbene-2,2'-disulfonate | * |
| Systems Integration Test Station | * |
| Sports Illustrated Tourney Score | * |
| System INTEGRATED Test STATION | * |