| Acronym | Meaning |
 | CAL | Continental Air Lines |
 | NSPI | National Society For Programmed Instruction |
 | TOM | Trunk Operations Monitor |
 | SAO | Semiannual Oscillation |
 | IRC | International Radiation Commission |
 | HEIFE | Heihe Basin Field Experiment |
 | GOTS | GALE Oceanographic Temperature Studies |
 | PERL | Practical Extraction And Report Language |
 | DB | Direct Broadcast |
 | NDVI | Greeness Index From Satellites |