The angel of the abyss in the Book of Revelation is Abaddon. Revelation 9:11 names him as the angel of the bottomless pit and gives his Greek equivalent as Apollyon, meaning “Destroyer.”
Abaddon is also a Hebrew term associated with destruction or the realm of the dead in earlier biblical books, including Job and Proverbs. Revelation develops the word into the name of a supernatural ruler who commands a locust-like army released from the abyss.
The imagery is highly symbolic: the creatures resemble horses, wear crowns, and torment people for five months. The passage does not clearly identify Abaddon as Satan, and Christian interpreters have disagreed. Some have linked him with the Antichrist or Satan, while others understand him as an angel carrying out divine judgment.
A common mix-up is treating Abaddon and Apollyon as separate beings. In Revelation 9:11, they are the Hebrew and Greek names for the same figure. The name is distinct from Lucifer, Belial, and Beelzebub, which come from different traditions and passages.