Ῥουβίκων

From LSJ

Ἔοικα γοῦν τούτου γε σμικρῷ τινι αὐτῷ τούτῳ σοφώτερος εἶναι, ὅτι ἃ μὴ οἶδα οὐδὲ οἴομαι εἰδέναι → I seem, then, in just this little thing to be wiser than this man at any rate, that what I do not know I do not think I know either

Plato, Apology 21d

Russian (Dvoretsky)

Ῥουβίκων: ωνος ὁ Рубикон (река на границе между Галлией Цизальпинской и Умбрией) Plut.