'Sign' in the Bible

The Jews therefore answered and said unto him, What sign showest thou unto us, seeing that thou doest these things?

This is again the second sign that Jesus did, having come out of Judaea into Galilee.

When therefore the people saw the sign which he did, they said, This is of a truth the prophet that cometh into the world.

They said therefore unto him, What then doest thou for a sign, that we may see, and believe thee? what workest thou?

And many came unto him; and they said, John indeed did no sign: but all things whatsoever John spake of this man were true.

For this cause also the multitude went and met him, for that they heard that he had done this sign.