| Acronym | Meaning |
| NCAM | Neural Cell Adhesion Molecule |
| TRMM | Tropical Rainfall Measuring Mission |
| PIR | Protein Identification Resource |
| IPDI | Isophorone Diisocyanate |
| POAM | Polar Ozone And Aerosol Measurements |
| ITFM | Intergovernmental Task Force On Monitoring |
| OBD | On-board Diagnosis |
| FTMS | Fourier Transform Mass Spectrometry |
| MOT | Multistate Orbital Treatment |
| ISM | Intersecting Spheres Model (for Electronic-structure Calcns.) |