'Signs' in the Bible

Because there will be false Christs and false prophets, and they will give signs and wonders in the hope of turning even the saints from the true way.

And these signs will be with those who have faith: in my name they will send out evil spirits; and they will make use of new languages;

And they went out, preaching everywhere, the Lord working with them, and giving witness to the word by the signs which came after. So be it.