| Acronym | Meaning |
 | PG | Picogram |
| NASA | National Aeronautics And Space Administration |
| MHLW | Mean Higher Low Water (nautical Charts) |
| RTG | Radio-isotope Thermoelectric Generator Also Used For Rubber Tyred Gantry Crane |
| FAA | U.S. Federal Aviation Administration - Financial Aid Administrator - Fleet Air Arm - Functional Area Analysis |
| MEK | Magyar Elektronikus Konyvtar - Message Encryption Key - Methyl Ethyl Ketone -Mujahideen Al-Khalq |
| OK | Oklahoma (postal Symbol) -oll Korrect (facetious Alteration Of All Correct |
| AF | Afghanistan (FIPS 10-4 Country Code; ISO 3166 Digram) -Air Force |
| HOPI | Hybrid Optical And Packet Infrastructure (see Internet2 |
| USGS | United States Geological Survey |
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