'Sign' in the Bible

“Ask for a sign from the Lord your God—from the depths of Sheol to the heights of heaven.”

Therefore, the Lord Himself will give you a sign: The virgin will conceive, have a son, and name him Immanuel.

It will be a sign and witness to the Lord of Hosts in the land of Egypt. When they cry out to the Lord because of their oppressors, He will send them a savior and leader, and he will rescue them.

the Lord said, “As My servant Isaiah has gone naked and barefoot three years as a sign and omen against Egypt and Cush,

“‘This will be the sign for you: This year you will eat what grows on its own, and in the second year what grows from that. But in the third year sow and reap, plant vineyards and eat their fruit.

This is the sign to you from the Lord that He will do what He has promised:

And Hezekiah had asked, “What is the sign that I will go up to the Lord’s temple?”

Instead of the thornbush, a cypress will come up,and instead of the brier, a myrtle will come up;it will make a name for Yahwehas an everlasting sign that will not be destroyed.

I will establish a sign among them, and I will send survivors from them to the nations—to Tarshish, Put, Lud (who are archers), Tubal, Javan, and the islands far away—who have not heard of My fame or seen My glory. And they will proclaim My glory among the nations.