'Sign' in the Bible

And you shall bind them as a sign on your hand (forearm), and they shall be used as bands (frontals, frontlets) on your forehead.

“Therefore, you shall impress these words of mine on your heart and on your soul, and tie them as a sign on your hand, and they shall be as bands (frontals, frontlets) on your forehead.

“If a prophet arises among you, or a dreamer of dreams, and gives you a sign or a wonder,

and the sign or the wonder which he spoke (foretold) to you comes to pass, and if he says, ‘Let us follow after other gods (whom you have not known) and let us serve and worship them,’

They will be a sign and a wonder to you and your descendants forever.