'Sign' in the Bible

And thou, take to thee an iron pan, and thou hast made it a wall of iron between thee and the city; and thou hast prepared thy face against it, and it hath been in a siege, yea, thou hast laid siege against it. A sign it is to the house of Israel.

and I have set My face against that man, and made him for a sign, and for similes, and I have cut him off from the midst of My people, and ye have known that I am Jehovah.

And also My sabbaths I have given to them, To be for a sign between Me and them, To know that I am Jehovah their sanctifier.

And My sabbaths sanctify, And they have been for a sign between Me and you, To know that I, Jehovah, am your God.

And those passing by have passed through the land, and seen a bone of man, and one hath constructed near it a sign till those burying have buried it in the valley of the multitude of Gog.