You see the middle part in this joint, right?
Not the two elements with mortises in them.. the thing in between them? That joins them together once you glue and clamp it?
It’s an interesting way to join two boards without creating an integral tenon on one of them.
But, what do you call it? I’ve seen woodworkers get worked up about different terms for it. They will argue their point all day long that a certain term applies, and none of the other make sense.
So, what do you call it in your shop?