In theoretical physics, type II string theory is a unified term that includes both type IIA strings and type IIB strings. These account for two of the five consistent superstring theories in ten dimensions. Both theories have the maximal amount of supersymmetry — namely 32 supercharges — in ten dimensions. Both theories are base on oriented closed strings.

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	Type II string theory - Wikipedia, the free encyclopedia (329 words) The mathematical treatment of type IIA string theory belongs to symplectic topology and algebraic geometry, particularly Gromov-Witten invariants. At low energies, type IIB string theory is described by type IIB supergravity in ten dimensions which is a chiral theory (left-right asymmetric) with (2,0) d=10 supersymmetry; the fact that the anomalies in this theory cancel is therefore nontrivial. The mathematical treatment of type IIB string theory belongs to algebraic geometry, specifically the deformation theory of complex structures originally studied by Kunihiko Kodaira and Donald C. Spencer. Superstring theory - Wikipedia, the free encyclopedia (1007 words) Superstring theory is a shorthand for "supersymmetric string theory" because unlike bosonic string theory, it is the version of string theory that incorporates fermions and supersymmetry. The graviton (the proposed messenger particle of the gravitational force), for example, is predicted by the theory to be a string with wave amplitude zero. The heterotic string theories are based on a peculiar hybrid of a type I superstring and a bosonic string.
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