| Acronym | Meaning |
 | SSP | Submarine Transport (retired US Navy Hull Classification) |
| EI | Ireland (FIPS 10-4 Country Code; From ire) |
| MH | Marshallese Language (ISO 639-1 Code) |
| YO | Former Yugoslavia (NATO Country Code |
| POETS | Portable Occultation |
| FIFO | First In |
| IB | International Baccalaureate |
| USC | United States Code - University Of South Carolina - University Of Southern California |
| CACM | Communications Of The ACM |
| TTTEAF | Thomas The Tank Engine And Friends |
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