666 is the natural number following 665 and preceding 667.
A 666 float in a Paris street parade
The Beast may refer to one of three beasts described in the Book of Revelation.
Satan (the dragon; on the left) gives to the beast of the sea (on the right) power represented by a sceptre in a detail of panel III.40 of the medieval French Apocalypse Tapestry, produced between 1377 and 1382.
The Revelation of St John: 12. The Sea Monster and the Beast with the Lamb's Horn. A woodcut by Albrecht Dürer
A coin bearing the Greek name and image of Nero, with radiant crown symbolizing the sun