| Acronym | Meaning |
| MSO | Multiple System Operator |
| PW | Palau (postal Symbol; ISO 3166 Digram) - Petawatt |
| SSN | Nuclear-Powered Attack Submarine (US Navy Hull Classification) -SIM Serial Number - Social Security Number - Socialist Solidarity Network - Subsystem Number (SCCP |
| E&OE | Errors And Omissions Excepted |
| E? OR E3 | Many |
| E | East |
| SEK | Swedish Krona (ISO 4217 Currency Code) |
| IMT | Integrated Management Tool |
| WXO | Weather [Executive] Officer |
| SSGN | Nuclear-Powered Guided Missile Submarine (US Navy Hull Classification) |