'Sign' in the Bible

the Jews then answered and said to him, 'What sign dost thou shew to us -- that thou dost these things?'

this again a second sign did Jesus, having come out of Judea to Galilee.

The men, then, having seen the sign that Jesus did, said -- 'This is truly the Prophet, who is coming to the world;'

They said therefore to him, 'What sign, then, dost thou, that we may see and may believe thee? what dost thou work?

and many came unto him, and said -- 'John, indeed, did no sign, and all things, as many as John said about this one were true;'

because of this also did the multitude meet him, because they heard of his having done this sign,