'Sign' in the Bible

saying, 'What shall we do to these men? because that, indeed, a notable sign hath been done through them, to all those dwelling in Jerusalem is manifest, and we are not able to deny it;

for above forty years of age was the man upon whom had been done this sign of the healing.

And after three months, we set sail in a ship (that had wintered in the isle) of Alexandria, with the sign Dioscuri,