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| |Isp|Specific impulse (as explained by Scott Manley on YouTube)| | |Internet Service Provider| |LEO|Low Earth Orbit (180-2000km)| | |Law Enforcement Officer (most often mentioned during transport operations)| |N1|Raketa Nositel-1, Soviet super-heavy-lift ("Russian Saturn V")| |SLS|Space Launch System heavy-lift| |TPS|Thermal Protection System for a spacecraft (on the Falcon 9 first stage, the engine "Dance floor")|

|Jargon|Definition| |-------|---------|---| |Raptor|Methane-fueled rocket engine under development by SpaceX|

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