| Acronym | Meaning |
 | YA | Yottayear |
| ERI | Eritrea (ISO 3166 Trigram) |
| SX | Sonic X |
| VFR | Visual Flight Rules |
| OSETI | Optical SETI |
| PRM | Personnel Readiness Management |
| MO | Macao (ISO 3166 Digram) -Medical Officer -Missouri (postal Symbol) -modus Operandi (Latin |
| TANJ | There Ain't No Justice (used As Expletive In The Ringworld Novels) |
| NSO | National Standardization Office (ABCA) |
| LTD | Limited |
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