So would you say I solved the case?

I think Skua might be right, d2?

How can it be a D2, I can literally see 3 sides with my very eyes.

It can be viewed as two interlocking 'c' shapes, so it *could* be dressed as a d4, with a different value at each end of the 'c.' Alternatively, each 'c' can be considered a single side, making it a d2. Since we already have d4 well represented by the 4-sided triangle, aka tetrahedron d4, this design strikes me as more valuable as a d2