What is "cassiel"

Cassiel, (also known as Cafziel, Cafzyel, Caphziel, Casiel, Cassael, Casziel, Kafziel, Kasiel, Qafsiel, Qaphsiel, Qaspiel, Qephetzial, or Quaphsiel), meaning "Speed of God" or "God is my anger" is an angel appearing in extracanonical Jewish, Christian, and Islamic mystical and magical works, often as one of the Seven Archangels, the angel of Saturn, and in other roles.