Threefold-symmetry in non-landing spacecraft?

Question

Many spacecraft have twofold symmetry, some have fourfold symmetry.

Have any spacecraft had threefold symmetry?

I'm specifically looking at ones that don't land on the surface of a planet/moon/whatever.

Answer 1

There is COBE the Cosmic Background Explorer.

And the Inflatable Antenna Experiment launched on STS-77

At least until it got all twisted up.