This is a question for those who are familiar with topological periodic table. The first row and right side columns represents dimensions of topological materials in periodic table. I know that for $d=1$ we are talking about nanowire, for $d=2$ we are talking about film or coating on the surface, for $d=3$ we are talking about bulk material. What $d=4$,$d=5$.....$d=8$ represents? How to visualize it?
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