Board Thread:Bible Questions/@comment-28569169-20160708152222/@comment-1777104-20160709213833

These two names, meanig "Destruction" are given to "the angel of the bottomless pit" and is most likely Satan himselfRev. 9:11.
Oddly, the chapter and verse correspond with the date infamous in American history: 9/11.  If nothing else, that helps memorization of the verse (or finding in quickly, anyway).
In Rev. 9:1 this angel, who has fallen from heaven, is given a key to the bottomless pit.  He is used by God to unleash a horrible swarm of demonic stinging locusts to torment the enemies of Jesus near the end of a time of judgment against the whole earth.  He then leads the horde of demons into the world.
Thanks for asking.