  Superconductivity is characterized by a nonvanishing superconducting pair
amplitude. It has a definite symmetry in spin, momentum and frequency (time).
While the spin and momentum symmetry have been probed experimentally for
different classes of superconductivity, the odd-frequency nature of certain
superconducting correlations has not been demonstrated yet in a direct way.
Here we propose the thermopower as an unambiguous way to assess odd-frequency
superconductivity. This is possible since the thermoelectric coefficient given
by Andreev-like processes is only finite in the presence of odd-frequency
superconductivity. We illustrate our general findings with a simple example of
a superconductor-quantum dot-ferromagnet hybrid.
