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

|Fewer Letters|More Letters| |-------|---------|---| |CC|Commercial Crew program| | |Capsule Communicator (ground support)| |ESA|European Space Agency| |LEO|Low Earth Orbit (180-2000km)| | |Law Enforcement Officer (most often mentioned during transport operations)|

|Jargon|Definition| |-------|---------|---| |periapsis|Lowest point in an elliptical orbit (when the orbiter is fastest)|

^(4 acronyms in this thread; )^(the most compressed thread commented on today)^( has 16 acronyms.)
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