| Acronym | Meaning |
 | TANJ | There Ain't No Justice (used As Expletive In The Ringworld Novels) |
| UPU | Universal Postal Union |
| R3P | Rearm |
| SSGN | Nuclear-Powered Guided Missile Submarine (US Navy Hull Classification) |
| IAF | Industrial Areas Foundation |
| KC | Kilocoulomb |
| TPTB | The Powers That Be (often Used To Refer To The People Responsible For The Content Of TV Series Or Movies) |
| FG | Fog (METAR Code) - French Guiana (FIPS 10-4 Territory Code) |
| ABW | Aruba (ISO 3166 Trigram) |
| JPN | Japan (ISO 3166 Trigram) |
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