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A two-legged ladder model, one dimensional, exhibiting the parity anomaly isconstructed. The model belongs to the $C$ and $CI$ symmetry classes, dependingon the parameters, but, due to reflection, it exhibits topological insulation.The model consists of two superimposed Creutz models with onsite potentials.The topological invariants for both cases are {\it mirror winding numbers,}which are nonzero individually in the topological phase, but sum to zerooverall in both phases. We demonstrate the presence of edge states andquantized Hall response in the topological region. Our model exhibits twodistinct topological regions, distinguished by the different types ofreflection symmetries.

Topological insulation in a ladder model with particle-hole and reflection symmetries