'Sign' in the Bible

saying, What shall we do to these men? for that indeed an evident sign has come to pass through their means is manifest to all that inhabit Jerusalem, and we cannot deny it.

for the man on whom this sign of healing had taken place was above forty years old.

And having made a sign to them with his hand to be silent, he related to them how the Lord had brought him out of prison; and he said, Report these things to James and to the brethren. And he went out and went to another place.

And Paul, rising up and making a sign with the hand, said, Israelites, and ye that fear God, hearken.