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Taub-NUT spacetime is a spacetime model developed by Ezra T. Newman, Louis A. Tamburino, and Theodore W. J. Unti (whose initials are N, U, and T) in the early 1960s to model rotating black holes, extending Taub spacetime by handling more situations mathematically. The associated metric is the Taub-NUT metric, which incorporates a parameter termed the NUT parameter. Kerr spacetime provided a more general and realistic model. I believe Taub-NUT spacetime has some current interest as a potentially-useful approximation in some circumstances, and in theoretical exploration.