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βᾶς

From LSJ

Ὁ αὐτὸς ἔφησε τὸν μὲν ὕπνον ὀλιγοχρόνιον θάνατον, τὸν δὲ θάνατον πολυχρόνιον ὕπνον → Plato said that sleep was a short-lived death but death was a long-lived sleep

Gnomologium Vaticanum, 446

French (Bailly abrégé)

(ὁ) :
seul. voc. βᾶ;
roi, prince.
Étymologie: cf. βασιλεύς -- cf. βᾶ pour une autre étym. selon DELG.