According to the last book in the Bible, 666 is the number, or name, of the wild beast with seven heads and ten horns that comes out of the sea. (Revelation 13:1, 17, 18) This beast is a symbol of the worldwide political system, which rules over “every tribe and people and tongue and nation.” (Revelation 13:7) The name 666 identifies the political system as a gross failure in God’s sight. How? God named the beast 666 as a symbol of its defining attributes. The number six implies imperfection. Often, numbers are used as symbols in the Bible. Seven typically represents completeness or perfection. Six, being one short of seven, can denote something incomplete or flawed in God’s eyes, and it can be associated with God’s enemies.—1 Chronicles 20:6; Daniel 3:1.
Three times for emphasis. The Bible sometimes stresses a matter by stating it three times. (Revelation 4:8; 8:13) So the name 666 powerfully emphasizes that God views human political systems as gross failures. They have been unable to bring lasting peace and security—things that only God’s Kingdom will achieve.