In orthodox stance, I pivot my rear foot and hips to my right, so my back is (almost) facing the target, then fire my front leg with the heel side (mostly) up. Another variation is stepping your lead leg back into south paw first.
When I practice this kick, it feels like I can generate more power than any other move. It's very fast to use and recover from. More so than the
standard back kick I've seen elsewhere. And I expect it would be useful as a leg kick to the knee or thigh. At least to the point of there being an occasional opportunity for its use. But I have never seen it used in MMA.
Can you explain the technique and usage of this kick in terms of its role in MMA (why isn't it used)? If this isn't named a back kick, what is its name?