'Sign' in the Bible

“Ask a sign for yourself from the Lord your God [one that will convince you that God has spoken and will keep His word]; make your request as deep as Sheol or as high as heaven.”

Therefore the Lord Himself will give you a sign: Listen carefully, the virgin will conceive and give birth to a son, and she will call his name Immanuel (God with us).

They have gone up to the temple and to Dibon, to the high places to weep.Moab wails over Nebo and over Medeba;Everyone’s head is shaved, and every beard is cut off [in mourning].

It will become a sign and a witness to the Lord of hosts in the land of Egypt; for they will cry to the Lord because of oppressors, and He will send them a Savior, a [Great] Defender, and He will rescue them.

And the Lord said, “Even as My servant Isaiah has walked stripped and barefoot for three years as a sign and forewarning concerning Egypt and Cush (Ethiopia),

“This shall be the sign [of these things] to you [Hezekiah]: you are to eat this year what grows of itself, and in the second year that which springs from the same, and in the third year you are to sow and harvest, and plant vineyards and eat their fruit.

“This shall be the sign to you from the Lord, that the Lord 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 the Lord?”

“Instead of the thorn bush the cypress tree will grow,And instead of the nettle the myrtle tree will grow;And it will be a memorial to the Lord,For an everlasting sign [of His mercy] which will not be cut off.”

I will set up a [miraculous] sign among them, and from them I will send survivors to the nations: Tarshish, Pul (Put), Lud, Meshech, Tubal and Javan, to the distant islands and coastlands that have not heard of My fame nor seen My glory. And they will declare and proclaim My glory among the nations.