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

Fewer Letters	More Letters
FCC	Federal Communications Commission
~	(Iron/steel) Face-Centered Cubic crystalline structure
HLS	Human Landing System (Artemis)

Jargon	Definition
Starlink	SpaceX’s world-wide satellite broadband constellation

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