the place of destruction equivalent to Orcus, joined with שְׁאול
as a proper name it is given to the angel-prince of the infernal regions, the minister of death and author of havoc on earth, and is rendered in greek by Ἀπολλύων Destroyer
Distribution of the word across the Bible: Revelation (1)
Revelation 9:11 — And they had a king over them, which is the angel of the bottomless pit, whose name in the Hebrew tongue is Abaddon (Ἀβαδδών), but in the Greek tongue hath his name Apollyon.