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| |NG|New Glenn, two/three-stage orbital vehicle by Blue Origin| | |Natural Gas (as opposed to pure methane)| | |Northrop Grumman, aerospace manufacturer|

|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| |hydrolox|Portmanteau: liquid hydrogen fuel, liquid oxygen oxidizer| |kerolox|Portmanteau: kerosene fuel, liquid oxygen oxidizer| |methalox|Portmanteau: methane fuel, liquid oxygen oxidizer|

^(7 acronyms in this thread; )^(the most compressed thread commented on today)^( has 25 acronyms.)
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