Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:
| Fewer Letters | More Letters |
|---|---|
| FTS | Flight Termination System |
| LOX | Liquid Oxygen |
| SECO | Second-stage Engine Cut-Off |
| SES | Formerly Société Européenne des Satellites, comsat operator |
| ~ | Second-stage Engine Start |
| USSF | United States Space Force |
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