'Sign' in the Bible

"Ask a sign of Yahweh your God; ask it either in the depth, or in the height above."

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

It will be for a sign and for a witness to Yahweh of Armies in the land of Egypt; for they will cry to Yahweh because of oppressors, and he will send them a savior and a defender, and he will deliver them.

Yahweh said, "As my servant Isaiah has walked naked and barefoot three years for a sign and a wonder concerning Egypt and concerning Ethiopia,

This shall be the sign to you. You will eat this year that which grows of itself, and in the second year that which springs from the same; and in the third year sow and reap and plant vineyards, and eat their fruit.

This shall be the sign to you from Yahweh, that Yahweh will do this thing that he has spoken.

Hezekiah also had said, "What is the sign that I will go up to the house of Yahweh?"

Instead of the thorn shall come up the fir tree; and instead of the brier shall come up the myrtle tree: and it shall be to Yahweh for a name, for an everlasting sign that shall not be cut off."

"I will set a sign among them, and I will send such as escape of them to the nations, to Tarshish, Pul, and Lud, who draw the bow, to Tubal and Javan, to the islands afar off, who have not heard my fame, neither have seen my glory; and they shall declare my glory among the nations.