| Acronym | Meaning |
 | SART | Situational Awareness Rating Technique |
| O | Oberst - Observer - Obstacle - Octal - Officer - Official - Oh - Operational - Operator - Oprah (magazine) - Outstanding -Oxygen |
| ARSC | Arctic Region Supercomputing Center |
| CONUS | Continental United States |
| LDC | Lesser Developing/Developed Country |
| JEE | Java Platform |
| ASTM | American Society For Testing And Materials |
| VMASC | Virginia Modeling Analysis & Simulation Center (vee-mask) |
| CMYK | Cyan Magenta Yellow Key/blacK (colour Model) |
| TPO | Thrombopoietin |
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