btw = by the way
wrt = with regard to
wtf = exclamation (not "why the fuss?")
CDC = Centers for Disease Control and Prevention
N95 = NIOSH rating for respirators (95% filtration)
NIOSH = National Institute for Occupational Safety and Health
qed = quantum electrodynamics
qcd = quantum chromodynamics
qm = quantum mechanics
blm = Black Lives Matter
vax = vaccine
fedi = fediverse
scotus = Supreme Court of the United States
potus = President of the United States
AI = artificial intelligence
scifi = science fiction
epr = Einstein–Podolsky–Rosen paradox
2A = Second Amendment (to the US Constitution)
25A = 25th Amendment, etc...
JPL = Jet Propulsion Laboratory
NASA = NASA (everyone knows what NASA is)
FDR = Franklin D. Roosevelt
JFK = John Fitzgerald Kennedy
DS9 = Star Trek: Deep Space Nine
TNG = Star Trek: The Next Generation
TOS = Star Trek: The Original Series; also, "Terms of Service"
CCP = Chinese Communist Party
ROC = Tiawan, Republic of China
UTC = Coordinated Universal Time
NPR = National Public Radio
BBC = British Broadcasting Corporation
OP = original post, original poster (the first post in this thread)
IR = infrared
lol = (I am) laugh(ing) out loud
STE(A)M = science, technology, engineering, (arts), math(s)
EM(R) = electromagnetic radiation
EMI = elecromagnetic interference
A,V,W = amps, volts, watts
u = micron
usec = microsecond
ms = millisecond
www = World Wide Web
@Pat WTF = What The Fuck.