| Acronym | Meaning |
 | FIFO | First In |
| SI | Slovenia (ISO 3166 And FIPS 10-4 Country Code Digram) -Socialist International - Sports Illustrated - Syst?me International (French |
| TM | Technical Manual - Theatre Missile - Thematic Mapper -trademark (often Written In Small Superscript Type: TM Or ?) -Turing Machine -Turkmenistan (ISO 3166 Digram) |
| UM | U.S. Minor Outlying Islands (postal Symbol; ISO 3166 Digram) |
| AFOSR | U.S. Air Force Office Of Scientific Research |
| ISEF | Intel International Science And Engineering Fair |
| PLAF | Product Line Architecture Framework |
| EVA | Extra-Vehicular Activity |
| FASCAM | Field Artillery Scatterable Mines |
| YA | Yottayear |
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