This is an approximation of the Triamond lattice, so named by Conway et al. in The Symmetries of Things. The ideal lattice would have lines of true 4-fold rotational symmetry. Here, we only approximate those lines. The trusses here follow Zometool green lines.
![](https://vorth.github.io/vzome-sharing/2024/07/13/23-08-02-900Z-Triamond-Lattice/meta-triamond-lattice-3.png)