'Sign' in the Bible

And he gave a sign the same day, saying, This is the sign which the LORD hath spoken; Behold, the altar shall be rent, and the ashes that are upon it shall be poured out.

The altar also was rent, and the ashes poured out from the altar, according to the sign which the man of God had given by the word of the LORD.

Now the men were looking for a sign of hope, so they quickly picked up on this and responded, “Yes, it is your brother Ben-hadad.”Then he said, “Go and bring him.”So Ben-hadad came out to him, and Ahab had him come up into the chariot.