I’m not really sure but I think I’ve seen this shape being called “fishing hook”.
Sry for replying to old stuff but …
Allow me to contribute with a game in progress:
This tesuji is often referred to as “mouse stealing oil”.
So, I’d like to call this shape “Mouse’s Den”
Don’t ask why the mouse would steal from its own den. I looked at some oil lamps first but the shape didn’t fit.