  In the last two decades, a vast variety of topological phases have been
described, predicted, classified, proposed, and measured. While there is a
certain unity in method and philosophy, the phenomenology differs wildly. This
work deals with the simplest such case: fermions in one spatial dimension, in
the presence of a symmetry group $G$ which contains anti-unitary symmetries. A
complete classification of topological phases, in this case, is available.
Nevertheless, these methods are to some extent lacking as they generally do not
allow to determine the class of a given system easily. This paper will take up
proposals for non-local order parameters defined through anti-unitary
symmetries. They are shown to be homotopy invariants on a suitable set of
ground states. For matrix product states, an interpretation of these invariants
is provided: in particular, for a particle-hole symmetry, the invariant
determines a real division super algebra $\mathbb{D}$ such that the bond
algebra is a matrix algebra over $\mathbb{D}$.
