'Sign' in the Bible

And thou shalt bind them for a sign on thy hand, and they shall be for frontlets between thine eyes.

And ye shall lay up these my words in your heart and in your soul, and bind them for a sign upon your hand, and they shall be for frontlets between your eyes.

If there arise among you a prophet, or one that dreameth dreams, and he give thee a sign or a wonder,

and the sign or the wonder come to pass that he told unto thee, when he said, Let us go after other gods, whom thou hast not known, and let us serve them,

And they shall be upon thee for a sign and for a wonder, and upon thy seed for ever.