To Mega Therion or Το Μεγα Θηριον is Greek for "The Great Beast" and is a reference to the Book of Revelation:
- Revelation 13:1 And I stood upon the sand of the sea, and saw a beast [θηριον, therion] rise up out of the sea, having seven heads and ten horns, and upon his horns ten crowns, and upon his heads the name of blasphemy. 2 And the beast which I saw was like unto a leopard, and his feet were as the feet of a bear, and his mouth as the mouth of a lion: and the dragon gave him his power, and his seat, and great authority.
See also:
- To Mega Therion -- an album by the Swiss death metal band Celtic Frost
- Number of the Beast (numerology)