'Sign' in the Bible

As for the censers of these men who sinned at the cost of their lives, they must be made into hammered sheets for covering the altar, because they presented them before the Lord and sanctified them. They will become a sign to the Israelites."

The Lord said to Moses, "Bring Aaron's staff back before the testimony to be preserved for a sign to the rebels, so that you may bring their murmurings to an end before me, that they will not die."