First of all, I am not a physicist. I'm a graduate math student and recently I came across the concept of T-duality. Actually I'm studying generalized complex geometry, which according to this paper (Generalized complex geometry and T-duality) can be used to get some nice interpretations of T-duality.
After reading some of it, I thought the "T" stand for torus, because the the fiber are torus. But then I found another paper (Spherical T-duality) defining T-duality for $SU(2)$-bundles. At first I asked myself "Why keep calling it T-duality, if the fiber are not torus anymore?" Probably it means something else...
So, what does the "T" stand for in T-duality?
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