LW seems to stand for Less Wrong: LessWrong (also written Less Wrong) is a community blog and forum focused on discussion of cognitive biases, philosophy, psych

LW seems to stand for Less Wrong: LessWrong (also written Less Wrong) is a community blog and forum focused on discussion of cognitive biases, philosophy, psychology, economics, rationality, and artificial intelligence, among other topics. https://en.wikipedia.org/wiki/LessWrong https://en.wikipedia.org/wiki/LessWrong