'Sign' in the Bible

And God said, This is the sign of the agreement which I make between me and you and every living thing with you, for all future generations:

I will put my bow in the cloud and it will be for a sign of the agreement between me and the earth.

And God said to Noah, This is the sign of the agreement which I have made between me and all flesh on the earth.

And when God sent me wandering from my father's house, I said to her, Let this be the sign of your love for me; wherever we go, say of me, He is my brother.

And said, Praise be to the Lord, the God of my master Abraham, who has given a sign that he is good and true to my master, by guiding me straight to the house of my master's family.

And Jacob said, Not so; but if I have grace in your eyes, take them as a sign of my love, for I have seen your face as one may see the face of God, and you have been pleased with me.

And he said, I will give you a young goat from the flock. And she said, What will you give me as a sign till you send it?

Then Judah sent his friend Hirah with the young goat, to get back the things which he had given as a sign to the woman: but she was not there.

So he gave them his blessing that day, saying, You will be the sign of blessing in Israel, for they will say, May God make you like Ephraim and Manasseh; and he put Ephraim before Manasseh.