'Sign' in the Bible

Ask for thee a sign from Jehovah thy God; ask for it in the deep, or in the height above.

Therefore will the Lord himself give you a sign: Behold, the virgin shall conceive and shall bring forth a son, and call his name Immanuel.

and it shall be for a sign and for a witness to Jehovah of hosts in the land of Egypt; for they shall cry unto Jehovah because of the oppressors, and he will send them a saviour and defender, who shall deliver them.

And Jehovah said, Like as my servant Isaiah hath walked naked and barefoot three years, a sign and a wonder concerning Egypt and concerning Ethiopia,

And this shall be the sign unto thee: there shall be eaten this year such as groweth of itself; and in the second year that which springeth of the same; but in the third year sow ye, and reap, and plant vineyards and eat the fruit thereof.

And this shall be the sign to thee from Jehovah, that Jehovah will do this thing that he hath spoken:

And Hezekiah had said, What is the sign that I shall go up into the house of Jehovah?

Instead of the thorn shall come up the cypress, and instead of the nettle shall come up the myrtle; and it shall be to Jehovah for a name, for an everlasting sign that shall not be cut off.

And I will set a sign among them, and I will send those that escape of them unto the nations, to Tarshish, Pul, and Lud, that draw the bow; to Tubal and Javan, to the isles afar off, that have not heard my fame, neither have seen my glory: and they shall declare my glory among the nations.