Tribrachidium?

Tribrachidium means three-armed, and it's the name of a type of Precambrian animal that had a very unusual three-fold symmetry which radiated from the middle.

My three-fold symmetry grows on the outside, which makes it more like a tree, to my mind. Animals grow from the middle out, trees grow on the outside only.

That's a yardstick, to show the side. A yardstick has 3 feet -- how tribrachish of it!

Here are some closer looks at each corner.

I like the herringbone look of the bottom.

And it is July 3, so does that make it Tridiem?

Carpe knitting!