'Sign' in the Bible

And this is the sign to you: you will see a young child folded in linen, in the place where the cattle have their food.

And Simeon gave them his blessing and said to Mary, his mother, See, this child will be the cause of the downfall and the lifting up of great numbers of people in Israel, and he will be a sign against which hard words will be said;

And he came into all the country round about Jordan, preaching baptism as a sign of forgiveness of sin for those whose hearts were changed.

And I say to you, Make requests, and they will be answered; what you are searching for, you will get; when you give the sign, the door will be open to you.

For to everyone who makes a request, it will be given; and he who is searching will get his desire; and to him who gives the sign, the door will be open.

And others, testing him, were looking for a sign from heaven from him.

And when a great number of people came together to him, he said, This generation is an evil generation: it is looking for a sign and no sign will be given to it but the sign of Jonah.

For even as Jonah became a sign to the Ninevites, so will the Son of man be to this generation.

And they said to him, Master, when will these things be? and what sign will there be when these events are to take place?