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| |ISRU|In-Situ Resource Utilization| |KSP|Kerbal Space Program, the rocketry simulator|

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