| Acronym | Meaning |
 | ORU | Orbital Replacement Unit |
| EIA | Electronic Industries Association |
| PCO | Polar Cap Observatory |
| MDC | Modified Direct Costs |
| WVIOP | Water Vapor Intensive Observing Period |
| NSSDC | National Space Science Data Center |
| FTOS | FGGE Tropical Observing System |
| IAGA | International Association Of Geomagnetism And Aeronomy |
| IRIS | Incorporated Research Institutions For Seismology |
| TELNET | TCP/IP Network |
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