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apocalyptic number (s) (noun)
The number 666, applied to the Beast in the book of Revelation, chapter 13, verse 18 of the New Testament of the Bible.

"Here is wisdom. 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 threescore and six."

—Authorized King James Version of the Holy Bible, 1611.

"This calls for wisdom: let him who has understanding reckon the number of the beast, for it is a human number, its number is six hundred sixty-six."

—The Holy Bible, Revised Standard Version, 1953.
This entry is located in the following units: apo-, ap-, aph- (page 1) calypto-, calypt- + (page 1) numer-, number- (page 1)