| Acronym | Meaning |
 | FID | Foreign Internal Defence |
| DTED | Digital Terrain Elevation Data (dee-ted) |
| PWLC | PieceWise Linear And Concave/Convex (describing A Mathematical Function) |
| DBF | Detection By Fire (weapon Launch Signature) |
| PDD | Past Due Date - Presidential Decision Directive |
| AAR | After-Action Review - Association Of American Railroads |
| RRSP | Registered Retirement Savings Plan (Canada; Roughly Equivalent To The IRA In The U.S.) |
| SPOT | Satellite Pour L'observation De La Terre (French |
| VIT | Vellore Institute Of Technology |
| CFHT | Canada-France-Hawaii Telescope |
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