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")| |HALO|Habitation and Logistics Outpost| |ICBM|Intercontinental Ballistic Missile| |ISRO|Indian Space Research Organisation| |Isp|Specific impulse (as explained by Scott Manley on YouTube)| | |Internet Service Provider| |JAXA|Japan Aerospace eXploration Agency| |JWST|James Webb infra-red Space Telescope| |LV|Launch Vehicle (common parlance: "rocket"), see ETOV| |SES|Formerly Société Européenne des Satellites, a major SpaceX customer| | |Second-stage Engine Start| |SSTO|Single Stage to Orbit| | |Supersynchronous Transfer Orbit| |STS|Space Transportation System (Shuttle)| |ULA|United Launch Alliance (Lockheed/Boeing joint venture)|

^(12 acronyms in this thread; )^(the most compressed thread commented on today)^( has 6 acronyms.)
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