| Acronym | Meaning |
 | GCN | Gamma-ray Burst Coordination Network |
| CFZ | Critical Friendly Zone |
| MWOA | Mount Wilson Observatory Association |
| ZL | Zettalitre |
| LIGO | Laser Interferometer Gravitational Wave Observatory |
| ITT | International Telephone And Telegraph (U.S.) |
| LJJ | Lord Justices Of Appeal |
| GDR | German Democratic Republic (cf. DDR) |
| SLR | Single-Lens Reflex (camera) |
| MH | Millihenry |
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