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

|Fewer Letters|More Letters| |-------|---------|---| |ESA|European Space Agency| |ETOV|Earth To Orbit Vehicle (common parlance: "rocket")| |LV|Launch Vehicle (common parlance: "rocket"), see ETOV|

^(2 acronyms in this thread; )^(the most compressed thread commented on today)^( has 55 acronyms.)
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