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

|Fewer Letters|More Letters| |-------|---------|---| |L4|"Trojan" Lagrange Point 4 of a two-body system, 60 degrees ahead of the smaller body| |L5|"Trojan" Lagrange Point 5 of a two-body system, 60 degrees behind the smaller body| |SLS|Space Launch System heavy-lift| |ULA|United Launch Alliance (Lockheed/Boeing joint venture)|

^(4 acronyms in this thread; )^(the most compressed thread commented on today)^( has 22 acronyms.)
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