'Sign' in the Bible

And a great sign was seen in the heaven, a woman arrayed with the sun, and the moon under her feet, and upon her head a crown of twelve stars,

And there was seen another sign in the heaven, and, lo, a great red dragon, having seven heads and ten horns, and upon his head seven diadems,

And I saw another sign in the heaven, great and wonderful, seven messengers having the seven last plagues, because in these was completed the wrath of God,