sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| Institute for Security Technology and Society | **** |
| International Sea Turtle Symposium | **** |
| Information Strategy and Technology Services | **** |
| International Society for Twin Studies | *** |
| International Symposium on Tubular Structures | *** |
| Initiative on Science and Technology for Sustainability | *** |
| International Society of Twin Studies | *** |
| Institute for Security and Technology Studies | *** |
| International Scholarship and Tuition Services | *** |
| Iowa Science Teachers Section | *** |
| International Styling Tuning Show | *** |
| Initiative for Science and Technology for Sustainability | *** |
| Institute of Security Technology Studies | *** |
| Initiative of Science and Technology for Sustainability | *** |
| isotonic sucrose-Tris solution | ** |
| Interpretive and Supportive Technique Scale | ** |
| Individual Sewer Treatment System | ** |
| International Society for Transcranial Stimulation | ** |
| International Symposium on Tea Science | ** |
| Intelligent Scalable Text Summarization | ** |
| International Society for Twins Studies | ** |
| International Society of Tea Science | ** |
| Institute of Space and Terrestrial | ** |
| International Sindhi Trade Show | ** |
| Individual Septic Treatment System | ** |
| International Simulation and Training Systems | ** |
| Information Strategy Technology Services | ** |
| Information Systems Training Section | ** |
| international satellite triangulation station | ** |
| Inter State Transmission System | ** |
| Integrated Short Term Schemes | ** |
| International Symposium of Transport Simulation | ** |
| International Simulation Training Systems | * |
| Illinois Standard Test Score | * |
| Improved Standard Technical Specifications | * |
| Information Systems Technology Services | * |
| International Spiritual Training Seminar | * |
| International School for Transformation and Synthesis | * |
| International Storage Technology Symposium | * |
| Information Systems and Technology Services | * |
| Innovative Sports Tracking Systems | * |
| Internet System to System | * |
| Individual Septic Tank Systems | * |
| Infrared Search and Track System | * |
| Internet Star Trek Society | * |
| Ion Source Test Standard | * |