Abaddon

Abaddon, also written as Apollyon, is a word that appears in the Bible in reference to both a place of destruction and an angel or demon of Hell. The words "Abaddon" and "Apollyon" are derived from the Hebrew and Greek words for "to destroy," respectively. Both names appear regularly in popular culture as names for villainous places, characters, or objects.

Judaism
Abaddon is mentioned in the Tanakh (Hebrew Bible) only as a location. It is a "place of destruction" compared with a consuming fire, and is almost always written of in conjunction with Sheol, the realm of the dead. In Second Temple era texts and rabbinical legends, Abaddon is either another name for Gehenna or a smaller part of that realm.

Christianity
In the Christian scriptures, Abaddon appears in the Book of Revelations and the New Testament apocrypha. Here, Abaddon is an angel rather than a place, also called Apollyon or the Latin name Exterminans ("destroyer"). Abaddon is variously identified as Satan, the Antichrist, a powerful fallen angel, or even a servant of God unleashing destruction at God's command. Abaddon/Apollyon is associated with a plague of demonic locusts that cause terrible pain with the unsaved with their stings.

As a location

 * Abaddon is the neutral evil plane in the Pathfinder roleplaying game's cosmology. It is home to daemons, who embody death and seek the destruction of all life in the cosmos.
 * In Daniel Arenson's Earthrise novel series, the homeworld of the ravenous centipede-like scum is named Abaddon. It is not supernatural or otherwise associated with Hell - it is "merely" very hostile.
 * In the third book of Elizabeth Donald's Nocturnal Urges series, titled Abaddon, a group of vampires call their underground fortress "Abaddon."
 * The town of Abaddon is the main setting of the Hell House LLC movie series.
 * Abaddon is a dark netherworld beneath Landover in Terry Brooks' Magic Kingdom of Landover series. It is populated by demons exiled from the fairy world, who seek to regain their home by conquering Landover as a stepping stone.