| Acronym | Meaning |
 | MSH | Medium Support Helicopter - Mount Saint Helens |
| ASSC | Association For The Scientific Study Of Consciousness |
| TWI | The Welding Institute |
| TIMS | Tactical Internet Management System - The Institute Of Management Sciences - The International Molinological Society - Thermal Infrared Multispectral Scanner - Thermal Ionization Mass Spectrometry - Travel Information Management Services - Tuberculosis In |
| LI | Limburgish Language (ISO 639-1 Code) |
| IRM | Illinois Railway Museum - Inzhenernaya Razvedyvatelnaya Mashina (Russian ?????????? ???????????????? ?????? |
| MBIDST | Member Of The British Institute Of Dental And Surgical Technologists |
| TMJ | TemporoMandibular Joint (syndrome) |
| ZUL | Zulu Language (ISO 639-2 Code) |
| SWG | Surface Warfare Group - Symbology Working Group |
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