'Signs' in the Bible

For false messiahs and false prophets will appear, and will produce signs and wonders in order to mislead, if possible, the elect.

And these signs will accompany those who believe: in my name they will expel demons, they will speak in new tongues,

And they went out [and] proclaimed everywhere, [while] the Lord was working together with [them] and confirming the message through the accompanying signs.]]