Back when coastersims existed, I did a launched invert with a similar element to this.....Except it was more a Quarter loop, then a half corkscrew positioned straight after the quarter loop. (So if you imagine a half corkscrew rotated into this position, the top of it would be sideways, and then of course the exit of the element was the same in reverse.
I think I called it a wave roll, since it looked like a big wave curling over.
I thought it looked more like a shoehorn and called it that, haha.
I really like this name actually. It's short and punchy...Doesn't have the pointless "Roll" word at the end.
Can we call it this please