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

|Fewer Letters|More Letters| |-------|---------|---| |BE-4|Blue Engine 4 methalox rocket engine, developed by Blue Origin (2018), 2400kN| |BO|Blue Origin (Bezos Rocketry)| |NG|New Glenn, two/three-stage orbital vehicle by Blue Origin| | |Natural Gas (as opposed to pure methane)| | |Northrop Grumman, aerospace manufacturer| |ULA|United Launch Alliance (Lockheed/Boeing joint venture)|

|Jargon|Definition| |-------|---------|---| |Raptor|Methane-fueled rocket engine under development by SpaceX| |Sabatier|Reaction between hydrogen and carbon dioxide at high temperature and pressure, with nickel as catalyst, yielding methane and water| |electrolysis|Application of DC current to separate a solution into its constituents (for example, water to hydrogen and oxygen)| |methalox|Portmanteau: methane fuel, liquid oxygen oxidizer|

^(7 acronyms in this thread; )^(the most compressed thread commented on today)^( has 11 acronyms.)
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