Oh, derived from the word "ANGEL."
Appropriate.
The Big Bang Theory Season 4, Episode 22
...then Storm, Angel, the Bea...
No, wait, Nightcrawler.
The Big Bang Theory Season 2, Episode 1
We call her the Angel of Death.
Vikings Season 1, Episode 6
But you never know for certain
what a guardian ANGEL looks like,
Money Heist Season 1, Episode 1
Professor X, Nightcrawler, Wolverine,
Cyclops, Iceman, then Storm, Angel...
The Big Bang Theory Season 2, Episode 1