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

|Fewer Letters|More Letters| |-------|---------|---| |CSA|Canadian Space Agency| |ESA|European Space Agency| |ESM|European Service Module, component of the Orion capsule| |JAXA|Japan Aerospace eXploration Agency| |SLS|Space Launch System heavy-lift|

^(5 acronyms in this thread; )^(the most compressed thread commented on today)^( has 26 acronyms.)
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