Question: I was wondering what does NS stand for? And also, I've noticed that there seem to be two different kinds of robots apart from NS-5. Their torso looks different. Are these just different NS-4 modifications, or are they even older versions, like NS-3 or NS-2?
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Chosen answer: With Isaac Asimov's robots its short for a common name. In the case of NS its short for Nestor, though in the movie the robot is called "Sonny" which switches the NS. In the books though its short for Nestor. Another example is the RB type robot (not in the movie), short for Robbie. It's safe to assume there are older models of the robots and that NS-3 and NS-2 are probably around.
lionhead