The story
From the rearranged initials of the authors of the paper, Newman, Tamburino and Unti (1963), who independently rediscovered the solution originally found by Taub (1951).
Etymology from Wiktionary, CC BY-SA 4.0.
NUT space
Today it means: A particular solution of the Einstein field equations associated with massive objects that have a gravitomagnetic charge. Full definition →