| Acronym | Meaning |
| MISSI | Multilevel Information System Security Initiative |
| CYM | Welsh Language (ISO 639-2 Code) |
| IRS | U.S. Internal Revenue Service |
| LMS | London Mathematical Society - London |
| JWST | James Webb Space Telescope |
| IN TRANS. | In Transitu (Latin |
| ETT | Embedded Training Team |
| SLV | Slovenian Language (ISO 639-2 Code) |
| PX | Post EXchange |
| BO | Back Orifice -Belarus (FIPS 10-4 Country Code) - Bolivia (ISO 3166 Digram) -Body Odor |