| Acronym | Meaning |
| CCM | Cyclic Cluster Model (in CNDO For Deep Levels In Solids) |
| EXOSAT | European X-ray Observatory Satellite |
| CSE | Correction (with The) Statistical Exchange Potential |
| PONA | Paraffins, Olefins, Naphthalenes, And Aromatics (in Petroleum Analysis) |
| EPS | Expanded Polystyrene |
| RTD | Resonant Tunneling Diode |
| FSCT | Federation Of Societies For Coatings Technology |
| GFN | Grain Fineness Number |
| GVHD | Graft Versus Host Disease |
| NPM | Nonpolar Material |