Numerous unconventional forms of aromaticity have been identified experimentally in the last decades; Möbius aromaticity in macrocycles and metallacycles, all-metal σ-aromaticity in the solid state, aromaticity in electronically excited states, and several other forms. Three-dimensional aromaticity (3D-aromaticity) is an intriguing topic introduced by Aihara in 1978 when he analyzed polyhedral boranes using a Hückel-type molecular orbital theoretical approach. Closo-boranes, such as [B12H12] 2-first synthesized in the 1950s, are highly stable compounds and emblematic 3D-aromatic compounds. Today, 3D-aromaticity is also found in metal clusters and some charged fullerenes, where the aromaticity of the latter is also classified as spherical aromaticity that follows Hirsch's 2(n+1) rule. The tetrahedral P4 molecule (white phosphorous) and Group 14 element E4 4-Zintl ions have been labelled as 3Daromatic, and this also applies to the Zn I 8 (Zn I 8(HL)4(L)8 12-