| Acronym | Meaning |
 | IOC | Initial Operational Capability - Intergovernmental Oceanic Commission - International Olympic Committee - International Ornithological Congress |
| HORIZON | H?licopt?re D'observation Radar Et D'investigation Sur Zone (French |
| ISDN | Integrated Services Digital Network |
| EC | Ecuador (ISO 3166 Digram; FIPS 10-4 Country Code) -Electronic Combat - European Community (see EEC) -Exacoulomb |
| TAT | Tourism Authority Of Thailand |
| NIEHS | National Institute Of Environmental Health Sciences |
| TM | Terametre - Thulium |
| JTF | Joint Task Force |
| SISO | Simulation Interoperability Standards Organization - Society Of Independent Show Organizers |
| FOO | Forward Observation Officer |
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