'Sign' in the Bible

Let them be fixed as a sign on your hand, and marked on your brow;

So keep these words deep in your heart and in your soul, and have them fixed on your hand for a sign and marked on your brow;

If ever you have among you a prophet or a dreamer of dreams and he gives you a sign or a wonder,

And the sign or the wonder takes place, and he says to you, Let us go after other gods, which are strange to you, and give them worship;

And now he has put shame on her, saying that she is not a virgin; but here is the sign that she is a virgin. Then they are to put her clothing before the responsible men of the town.

If you let your brother have the use of anything which is yours, do not go into his house and take anything of his as a sign of his debt;

These things will come on you and on your seed, to be a sign and a wonder for ever;