| Acronym | Meaning |
| IACS | International Annealed Copper Standard |
| IPES | Inverse Photoemission Spectroscopy |
| NSF | National Sanitation Foundation |
| BCCP | Biotin Carboxyl-carrier Protein |
| CTB | Computer Technology Branch |
| FDR | Frequency Domain Reflectometry |
| LOPT | Large-order Perturbation Theory |
| APMP | Acid Precipitation Mitigation Program |
| HCPA | Homomorphic Cluster Coherent Potential Approximation |
| APD | Action Potential Duration |