| Acronym | Meaning |
| GCC | Global Climate Coalition |
| GRIDS | Geographic Resources Information And Data System |
| QC-SCF | Quadratically Convergent SCF (for Closed-shell Systems) |
| MARB | Methanotropic Air-tight Rotating Bioreactor |
| NPSSMO | Nonpaired Spin Spatial Molecular Orbital |
| IGCP | International Geological Correlation Program |
| HSV | Herpes Simplex Virus |
| CCPA | Cluster Coherent Potential Approximation (for Electronic Structure Calcns.) |
| LNGFR | Low-affinity Nerve Growth Factor Receptor |
| TCM | Tunneling Current Microscopy |