Brane mapping under (−1)FL

We present the evidence that (−1)FL is a nonperturbative symmetry of Type II string theory. We argue that (−1)FL is a symmetry of string theory as much as the SL(2,Z) of the Type II string is and how the branes are mapped under the (−1)FL modding. NS branes are mapped into the NS branes with the same world volume dimensions but with the different chiral structure. Supersymmetric Dp-branes (bound with anti-Dp branes) are mapped to unstable nonsupersymmetric Dp-branes, which has D(p−1)-branes as kink solutions according to Horava [Type IIA D-branes, K Theory, And Matrix Theory, hep-th/9812135].