'Signs' in the Bible

Thus says Yahweh: "You must not learn the way of the nations, and you must not be dismayed by the signs of the heavens, for the nations are dismayed by them.

And you, you must not listen to your prophets, and to your diviners, and to your dreamers, and to your interpreters of signs, and to your sorcerers who are {saying}, 'You will not serve the king of Babylon.'

who accomplished signs and wonders in the land of Egypt, up to this day, and in Israel, and among humankind, and you have made for yourself a name, as [it is] this day.

And you brought out your people Israel from the land of Egypt with signs, and with wonders, and with a strong hand, and with an arm stretched out, and with great terror.