S-branes
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S-branes are space-like branes, hypothetical objects (or configurations) in string theory that are localized in the temporal direction, but otherwise analogous to P-branes. 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 "Spacelike", depending on the context.