666 and THE MARK OF THE BEAST
The book of the Revelation was written in Greek. The Greeks had no number figures; they used alphabets to represent numbers. The modern arithmetic number figures and number system were developed from Hindu-Arabic roots in early 13th century AD. In the old Greek number system, a number like 666 could be written in a thousand different ways! Any or all of these could be used by the Antichrist! Hence “Let him that has understanding count (calculate/figure out) the number of the beast” (Rev 13:18). In the Roman numeral system 666 is MCLXVI, which incidentally contains all the numeric letters that make up the Roman system!