'Sign' in the Bible

You shall bind them as a sign on your hand and they shall be as frontals on your forehead.

“You shall therefore impress these words of mine on your heart and on your soul; and you shall bind them as a sign on your hand, and they shall be as frontals on your forehead.

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

and the sign or the wonder comes true, concerning which he spoke to you, saying, ‘Let us go after other gods (whom you have not known) and let us serve them,’

They shall become a sign and a wonder on you and your descendants forever.