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ς

Ἓν οἶδα, ὅτι οὐδὲν οἶδα –> I know only one thing, that I know nothing | all I know is that I know nothing.
Diogenes Laertius, Lives of the Philosophers, Book 2 sec. 32.

English (Autenrieth)

(=1) σέ.—(2) rarely σοί, Α 1, Il. 21.122, cf. δῶκε δέ μ, Od. 10.19. — σά, Od. 1.356.