'Signet' in the Bible

the work of an engraver in stone, openings of a signet, thou dost open the two stones by the names of the sons of Israel; turned round, embroidered with gold, thou dost make them.

and the stones are according to the names of the sons of Israel, twelve, according to their names, openings of a signet, each by his name are they for the twelve tribes.

And thou hast made a flower of pure gold, and hast opened on it -- openings of a signet -- 'Holy to Jehovah;'

And they prepare the shoham stones, set, embroidered with gold, opened with openings of a signet, by the names of the sons of Israel;

And the stones, according to the names of the sons of Israel, are twelve, according to their names, openings of a signet, each according to his name, for the twelve tribes.

And they make the flower of the holy crown of pure gold, and write on it a writing, openings of a signet, 'Holy to Jehovah;'