What is "turiel"

Turiel (or Tûrêl; Aramaic: טוריאל; Greek: Τονριήλ) is a fallen Watcher in the ancient apocryphal text known as the Book of Enoch. In later translations, he is one of the 20 leaders of 200 fallen angels, mentioned eighteenth. The name is believed to originate from tuwr "rock" and El "God", meaning "rock of God", while the translation taken from M. A. Knibb's work on the Ethiopic Book of Enoch is either "Mountain of God" or "Rock of God".