| Acronym | Meaning |
 | M | Metre - Milli |
| AAA | Administration |
| NRO | U.S. National Reconnaissance Office |
| ET | Estonian Language (ISO 639-1 Code) |
| A4 | Many |
| SECAM | S?quentiel Couleur ? M?moire (French For Colour Sequential With Memory; TV Standard |
| SR | Sound Reinforcement - Supply Route -Suriname (ISO 3166 Digram) -Sveriges Radio (Swedish Radio Ltd) |
| JU | Juan De Nova Island (FIPS 10-4 Territory Code) |
| FU | Smoke (METAR Code) |
| LTP | Long-Term Potentiation |
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