Apoc'alyp'tic Number. In Revelation XIII, an account is given of the beast with seven heads and ten horns that deceives and oppresses mankind. The writer of the chapter, fearing to mention the name, probably of a Roman emperor whom he feared, speaks of him in this manner: "Let him that hath understanding count the number of the beast for it is the number of a man; and his number is Six hundred three score and six." Many interpretations of this number have been made, but the most favored explanation finds in the corresponding letters of the Hebrew numerical alphabet the name of Nero.