Theological interpretations
Versions of Christian eschatology which hold that that these prophecies refer to future events, typically hold that the Mark of the Beast is one way in which the antichrist will exercise power over the earth, during the period known as the Tribulation in the book of Revelation. Opinions as to what form it will take are varied. The literal interpretation is that it will be the number 666 imprinted on the skin, but conspiracy theorists imagine all sorts of devious possibilities tied in with recent technological developments. The notion that the mark is required for all commerce implies that the mark might actually be a special credit card... or that we might have to have our fingerprints scanned into a worldwide database in order to be recognized in business. Or the mark might be some kind of smart chip implanted into the body.
The number 666, which supposedly represents the name of the antichrist, is another source of controversy. There are various theories about the meaning of this verse, and there have been many attempts to show that a person is the Antichrist by relating his name to the number 666.
One interpretation is simply that 666 represents humankind in general because of the special significance that the number has in the Bible. Six is known as an "imperfect number" because it is one short of seven, the "perfect number" (seven days in the week, seven tongues of flame, seven spiritual gifts...). So three (the number of the Trinity) sixes is seen as extremely imperfect. Therefore, 666 represents imperfect man, while 777 represents God.
A more radical interpretation is that 666 is actually some kind of code based on the letters of someone's name. This sparks great public interest since it seems to provide some way to identify the antichrist. Numerologists like to devise clever ways of assigning numbers to letters so that the letters of a name will add up to this symbolic number. Probably the best-known scheme has A=100, B=101, and so on. With this code, the name "HITLER" adds up to 666. While these ideas are intriguing, they usually require many odd preconditions (you have to start with 100, you cannot include the first name) and work in a few languages only (in Spanish, for example, "HITLER" adds up to 668.)
For example, scholars who believe the Book of Revelation refers to real people and events argue that the number represents the value of Nero or Neron Caesar (נרון קסר, Nrwn Qsr*) in Hebrew letters, which also have numerical values (note that Hebrew is written from right to left):
r S q n w r n
666 = 200 + 60 + 100 + 50 + 6 + 200 + 50
Some early texts of the use 616 instead, which would represent the alternative Hebrew spelling נרו קסר,
666 represents all the numbers from 1 to 500 in descending order, namely D (500) + C (100) + L (50) + X (10) + V (5) + I (1), or DCLXVI.
violently killed the envoys of Christ".
In an alternate style of greek notation for numerals, 6 + 60 + 600 can be expressed as digamma koppa kappa which when superposed into a monogram, form the graffito form of the labrys very common on roman walls of the time, which is interesting considering what some characterise as misogynist tendencies in Revelations.