Oh, derived from the word "ANGEL."
The Big Bang Theory Season 4, Episode 22
Well... you know how Barry
has the voice of an ANGEL?
The Big Bang Theory Season 11, Episode 17
We call her the Angel of Death.
Vikings Season 1, Episode 6
Professor X, Nightcrawler, Wolverine,
Cyclops, Iceman, then Storm, Angel...
The Big Bang Theory Season 2, Episode 1