Board Thread:Bible Questions/@comment-28569169-20160708152222/@comment-31246436-20161004173007

SouthWriter wrote: These two names, meanig "Destruction" are given to "the angel of the bottomless pit" and is most likely Satan himself. Later on in the book, Satan is locked up in the Abyss or "bottomless pit". Also, he is referred to as the dragon. So it is unlikely that he is Abaddon.

However, do note that the one who will be given the key to the Abyss is a star that fell from heaven and no name is given. This does not necessarily refer to Satan but could refer to any demon (since they are fallen angels) but does not rule out that possibility.

Abaddon is the king of the demonic locusts and is not the demon who will unlock the Abyss. If he was, then John the Apostle likely would have said that Abaddon was the star that fell from heaven.