Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

|Fewer Letters|More Letters| |-------|---------|---| |C3|Characteristic Energy above that required for escape| |F1|Rocketdyne-developed rocket engine used for Saturn V| | |SpaceX Falcon 1 (obsolete medium-lift vehicle)| |JWST|James Webb infra-red Space Telescope|

^(3 acronyms in this thread; )^(the most compressed thread commented on today)^( has 10 acronyms.)
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