A figure 8 used properly for short SRT drops.
I believe every device I've shown so far in the last 18 pages all have one thing shared in common:
They pass THROUGH the device, as a bight, and a connector (caribiner) links
the rope (not necessarily the device)
directly to your saddle.
The simple devices we'll be moving into here very soon also share this,
slot blocks, as Dr. Storrick calls them, where
belay tube transconfigures to
belay plate.
Then we mix in some hooks and horns, ways to intrinsically lock off, .....
I feel like we're getting closer.