Physics, Science, Machine Learning, Artificial Intelligence, Statistical Mechanics.
https://en.wikipedia.org/wiki/Dirac_equation) In most of our context, “spin” is just like “bit”, some elementary unit s_i, at position i, that has two step 1/0, “+/-” or “up/down”. “Glass” means the system is typically getting in a state that has some internal “tanglement” between those elementary