Revelation 12:3; Revelation 13:1; Revelation 19:12

Revelation 12:3

3 Then another sign appeared in heaven: and behold, a great red dragon having seven heads and ten horns, and on his heads were seven diadems.

Revelation 13:1

1 And the dragon stood on the sand of the seashore. Then I saw a beast coming up out of the sea, having ten horns and seven heads, and on his horns were ten diadems, and on his heads were blasphemous names.

Revelation 19:12

12 His eyes are a flame of fire, and on His head are many diadems; and He has a name written on Him which no one knows except Himself.