| Acronym | Meaning |
 | PVC | Permanent Virtual Circuit |
| NATCA | National Air Traffic Control Administration |
| WOCE | World Ocean Circulation (or Climate) Experiment |
| TCCR | Technical Committee For Computing Resources |
| FLUIDS | MELPROG Subcode |
| NASDA | National Space Development Agency |
| NGO | Non-Government Organizations |
| SPPS | System Plot Package Simulator |
| PIDC | Precision Instrument Development Center |
| ALCLAD | Clad Aluminum Alloy |
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