| Acronym | Meaning |
| FPC | Fractional Parentage Coeff. (in Group-theor. Calcns.) |
| SPHF | Spin-polarized Hartree-Fock |
| ECIP | Energy Conservation Investment Program |
| MSS | Mobile Servicing Station [space Station] |
| ISST | International Subcommission On Stratigraphic Terminology |
| IMAPS | Interstellar Medium Absorption Profile Spectrograph |
| MAS | Magic Angle Spinning (solid State NMR) |
| MST | Microbial Source Tracking |
| BSE | Bovine Spongiform Encephalopathy |
| PRESS | Point Resolved Spectroscopy |