| Acronym | Meaning |
| SAAP | Spin Adapted Antisymmetrized Product (in MC-SCF Theory) |
| APS | Antiphospholipid Syndrome |
| LSDXC | Local-spin-density-exchange-correlation (for Mol. Property) |
| PCNA | Proliferating Cell Nuclear Antigen |
| BOA | Bond Orientational Anisotropy |
| ARPUS | Angle-resolved Ultraviolet Photoelectron Spectroscopy |
| RPP | Reverse Pulse Polarography |
| EKF | Extended Kalman Filter |
| FIRF | Finite Impulse Response Filter |
| PCILO | Perturbative Configuration Interaction Using Localized Orbitals |