| Acronym | Meaning |
| FOB | Fecal Occult Blood |
| MEIS | Medium Energy Ion Scattering |
| PSRG | Position-space Renormalization Group (for D.-of-states Calcns.) |
| FCCC | Framework Convention On Climate Change |
| MSD | Mean Square Displacement |
| HVAC | Heating, Ventilating, Air-conditioning |
| GWM | Groundwater Monitoring |
| HAMS | Helium Atoms Measurement System |
| PWEM | Partial-wave-expansion Method (in Electron Scattering Calcns.) |
| PAR | Proteinase-activated Receptor |