Nelchael

An angel belonging to the order of thrones and one of the 72 angels bearing the mystical name of God Shemhamphorae, according to Barrett, The Magus, and Ambelain, La Kabbale Pratique.  However, he appears to be not a holy angel but a fallen one who, in Hell, teaches astronomy, mathematics, and geography to his fellow demons.  His corresponding spirit is known as Sith.  (a)

N/A

Resource List - all entries are taken verbatim from the original source:

(a) "The Dictionary of Angels" by Gustav Davidson, © 1967