Roll Over
Sidewinder
Double In-Line Twist
So assuming Duane is as accurate as he's always been, I'd say it's generally referred to as a Roll Over.
http://www.coasterforce.com/info/inversions/serpent.php
This sight also mentions that Vekoma terms it as a "Roll Over"
The rollover can also be found on X-Car coasters, though it's taken in a very different fashion.
Hobbes: "What's the point of attaching a number to everything you do?"
Calvin: "If your numbers go up, it means you're having more fun."
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