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S-brane

In string theory, S-brane is a hypothetical and controversial counterpart of a D-brane, which, unlike a D-brane, localized in time. It is thought to be extended in the space-like/temporal directions only, but is otherwise analogous to P-branes. In other words, the only difference between S-branes and P-branes is that S-branes exist at only one point in time.

S-branes were originally proposed by Andrew Strominger in his speculative paper with Michael Gutperle, and another version of S-branes was studied by Ashoke Sen.

"S" stands for "Strominger", "Sen", or "Space-like", depending on the context.