(early mathematics for a rotating black hole spacetime)
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 extending
Taub spacetime by handling more situations mathematically.
Kerr spacetime provided a more general and realistic model.