| Acronym | Meaning |
| APPH | Auger Peak To Peak Height |
| HCN | US Historical Climatology Network |
| TDA | Tamm-Dancoff Approximation |
| HGCU | Hot-gas-cleanup Unit |
| RVS-SCF | Reduced Variational Space-self-consistent Field (in Quantum Calcns. On Hydrogen Bonding) |
| MAMU | Mobile (ambient) Air Monitoring Unit (Canada) |
| AGCI | Aspen Global Change Institute |
| TCM | Total Capacitance Method |
| PCN | Polychlorinated Naphthalene |
| MDGI | Mammary Gland-derived Growth Inhibitor |