as·tra·gal

ˈastrəɡəl/

noun

a convex molding or wooden strip across a surface or separating panels, typically semicircular in cross-section.

Architecture: a small semicircular molding around the top or bottom of a column.

a wooden molding that covers the gap between a pair of doors or casement windows.

a glazing bar, typically one used in cabinetmaking.

Also, a large genus of herbs and shrubs that look like this:

Origin

mid 17th century: from astragalus, partly via French astragale .

Oddly, "astragalus" is a synonym for "talus"...

noun Anatomy: the large bone in the ankle that articulates with the tibia of the leg and the calcaneum and navicular bone of the foot -- aka, the "ankle bone."

... as well as a geologic formation:

noun: a sloping mass of rock fragments at the foot of a cliff. Used to refer to both the slope and the rocks themselves.

Okay, so what does this:

... have to do with any of this?

WE HAVE NO IDEA. Research continues...

Have a theory? Please share your insights in the comments below, and thanks!