| Acronym | Meaning |
 | IN | India (FIPS 10-4 Country Code; ISO 3166 Digram) - Indiana (postal Symbol) - Infantry |
| PLIF | Planar Laser-Induced Fluorescence |
| CLO | Cornell Lab Of Ornithology |
| AEF | American Expeditionary Force |
| LIGO | Laser Interferometer Gravitational Wave Observatory |
| AWSIM | Air Warfare SIMulation |
| DODD | U.S. Department Of Defense Directive |
| KNVB | Koninklijke Nederlandse Voetbal Bond (Dutch For Royal Netherlands Football Association) |
| APOLLO | Apache Point Observatory Lunar Laser-ranging Operation |
| IDO | Ido Language (ISO 639-2 Code) |
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