| Acronym | Meaning |
 | AV | Attovolt |
| QED | Quantum Electrodynamics -quid Es Demonstrata Or Quod Erat Demonstrandum (Latin |
| PY | Paraguay (ISO 3166 Digram) - Person-Year -Portsmouth Yardstick |
| OPAC | Online Public Access Catalogue |
| LOA | Limit Of Advance |
| YN | Yoctonewton |
| NTP | Network Time Protocol |
| 4D | Four-dimensional (usually Three Spatial Plus One Temporal Dimension |
| KA | Kamov Design Bureau |
| SEG | Society Of Exploration Geophysicists |
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