  The Pentagon Model is an explicit supersymmetric extension of the Standard
Model, which involves a new strongly-interacting SU(5) gauge theory at
TeV-scale energies. We discuss embeddings of the Pentagon Model into string
theory, specifically N=1 supersymmetric type IIa intersecting D-brane models,
M-theory compactifications of G_2 holonomy, and heterotic orbifold
constructions.
