| Acronym | Meaning |
| IRA | Interim Response Actions |
| HCS | Heliospheric Current Sheet |
| FPC | Fractional Parentage Coeff. (in Group-theor. Calcns.) |
| UKAWRG | United Kingdom Acid Waters Review Group |
| AVCC-IOS | Azimuthal (and) Vibrational Close-coupled (rotational) Infinite Order Sudden |
| GDNF | Glial-derived Neurotrophic Factor |
| SOCMI | Synthetic Organic Chemical Manufacturing Industry |
| CCT | Continuous Cooling Transformation |
| VB | Valence Bond |
| AES | Auger Emission Spectroscopy |