| Acronym | Meaning |
| RFC | Request For Comment |
| NLTE | Non Local Thermodynamic Equilibrium |
| AVHRR | Advanced Very High Resolution Radiometer |
| ATLAS | Airborne Tunable Laser Absorption Spectrometer |
| JICA | Japan International Development Agency |
| M-PDU | Multiplexed Protocol Data Unit |
| SCST | State Committee On Science & Technology |
| ALA-O | Delta-aminolevulinic Acid Dehydrates |
| RDT&E | Research, Development, Test And Evaluation |
| NCMRWF | India's National Centre For Medium Range Weather Forecasting |