I was never able to get my head around it, but this reminds me somewhat of the zx-calculus: https://en.wikipedia.org/wiki/ZX-calculus https://en.wikipedia.org/

I was never able to get my head around it, but this reminds me somewhat of the zx-calculus: https://en.wikipedia.org/wiki/ZX-calculus https://en.wikipedia.org/wiki/ZX-calculus