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

|Fewer Letters|More Letters| |-------|---------|---| |H2|Molecular hydrogen| | |Second half of the year/month| |LEO|Low Earth Orbit (180-2000km)| | |Law Enforcement Officer (most often mentioned during transport operations)| |SLS|Space Launch System heavy-lift| |SSME|Space Shuttle Main Engine| |SSTO|Single Stage to Orbit| | |Supersynchronous Transfer Orbit|

|Jargon|Definition| |-------|---------|---| |hydrolox|Portmanteau: liquid hydrogen fuel, liquid oxygen oxidizer|

^(6 acronyms in this thread; )^(the most compressed thread commented on today)^( has 18 acronyms.)
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