They were demonic spirits, performing signs (sēmeia | σημεῖα | acc pl neut), who go out to the kings of the whole world to assemble them for battle on the great day of God the Almighty.

Then I saw another sign (sēmeion | σημεῖον | acc sg neut) in heaven, great and marvelous: seven angels with seven plagues, which are the last, because with them the wrath of God is finished.

and by the signs (sēmeia | σημεῖα | acc pl neut) he was allowed to perform on behalf of the beast, he deceived those who live on the earth. He told them to make an image in honor of the beast who had been wounded by the sword yet lived.

He performed impressive signs (sēmeia | σημεῖα | acc pl neut), even making fire come down from heaven in the sight of everyone;

Then another sign (sēmeion | σημεῖον | nom sg neut) appeared in heaven: a huge red dragon that had seven heads and ten horns, and on its heads were seven crowns.

Then a great sign (sēmeion | σημεῖον | nom sg neut) appeared in heaven: a woman clothed with the sun, with the moon under her feet, and on her head was a crown of twelve stars.

while God supported their testimony by signs (sēmeiois | σημείοις | dat pl neut) and wonders and various miracles, and by gifts of the Holy Spirit distributed according to his will.

The greeting is with my own hand — Paul’s — which is a mark (sēmeion | σημεῖον | nom sg neut) of genuineness in every letter; so I write.

The coming of the lawless one will be according to the activity of Satan, with all kinds of false miracles, signs (sēmeiois | σημείοις | dat pl neut), and wonders,

The marks (sēmeia | σημεῖα | nom pl neut) of an apostle were done among you with all persistence, along with signs (sēmeiois | σημείοις | dat pl neut) and wonders and powerful deeds.