mark of the beast

noun2

1. •
   A mark on the person of worshippers of the Antichrist; without the mark one cannot buy or sell.

   • 'Tis much disputed who Antichrist is, I think 'tis the Rump, nor am I in jest, For indeed, although of the number it miss, Of this I am sure 'thas the mark of the Beast. — 1662
2. •
   (slang, no longer used) The patches on the lapels of a midshipman's jacket.