| Acronym | Meaning |
| CCPA | Cluster Coherent Potential Approximation (for Electronic Structure Calcns.) |
| ICTV | International Committee On The Taxonomy Of Viruses |
| ASCA | Advanced Satellite For Cosmology And Astrophysics |
| IAP | Immunosuppressive Acidic Protein |
| HDF | Halogenated Dibenzofuran(s) |
| AICUZ | Air Installation Compatible Use Zones |
| NGC | New General Catalog Of Nebula And Clusters Of Starspar |
| CHAOS | Canadian High Acceptance Orbit Spectrometer |
| MR-CCI | Multireference Contracted Configuration Interaction |
| THESEO | Third European Stratospheric Experiment On Ozone |