βουλλωτήριον

From LSJ

πολλοὶ γάρ εἰσιν κλητοὶ ὀλίγοι δὲ ἐκλεκτοί → many are called, but few are chosen

Source

Spanish (DGE)

-ου, τό sello, Cat.Cod.Astr.10.85.