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 mappe d 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. S upersymmetric D p-branes (bound with anti-Dp branes) are mapped to unstable nonsupersymmetric Dp-branes, which has D(p-1)-branes as kink solutions acc ording to Horava [Type IIA D-branes, K Theory, And Matrix Theory, hep-th/98 12135], (C) 1999 Elsevier Science B.V. All rights reserved.