'Forehead' in the Bible

And he causes all [people], the small and the great, and the rich and the poor, and the free and the slave, that they give them a mark on their right hand or on their forehead,

And another third angel followed them, saying with a loud voice, "If anyone worships the beast and his image and receives a mark on his forehead or on his hand,

And on her forehead a name [was] written, a mystery: "Babylon the great, the mother of prostitutes and of the detestable things of the earth."

And I saw thrones, and they sat down on them, and authority to judge was granted to them. And [I saw] the souls of those who had been beheaded because of the testimony about Jesus and because of the word of God, and who had not worshiped the beast or his image, and did not receive the mark on their forehead and on their hand, and they came to life and reigned with Christ [for] a thousand years.