| Acronym | Meaning |
| PSCA | Periodic Small-cluster Approach (a Many-body Technique In Electronic-structure Calcns.) |
| ESD | Equiv. Spherical Diam. |
| NPSSMO | Nonpaired Spin Spatial Molecular Orbital |
| ACOIN | Australian Core Inventory |
| LOPT | Lowest-order Perturbation Theory |
| BTK | Bruton Tyrosine Kinase |
| CIV | Critical Ionization Velocity (ionosphere) |
| PCNA | Proliferating Cell Nuclear Antigen |
| ALK | Anaplastic Lymphoma Kinase |
| RADW | Rotationally-adiabatic Distorted-wave |