Borromean rings

Cromwell, P., Beltrami, E., Rampichini, M. (1998) The Borromean rings. Math. Intelligencer 20, 53-62. 

Figure 9.38 (a) A 6,3-sheet of [Ag2(9.14b)3] (BF4)2 and (b) the 2D— 2D parallel Borromean interpenetrating network that it forms with the means planes of the 2D sheets coincidental. The Ag atoms (spheres) lie above each other, held by argentophilic interactions, (c) Borromean rings in black on white marble at the Cappella Rucellai in the Church of San Pancrazio, now the Marino Marini Museum, in Florence. The rings form part of the coat of arms of the Borromeo family and are also said to be a symbol of the Florentine de Medici family (photograph courtesy of Prof. L. J. Barbour).37... 

There are also chiral topological supramolecular structures in molecular knots, rotaxanes, catenanes, and Borromean rings with metal complexes.73,74... 

One of the most graphical recent examples are Stoddarfs Borromean rings ... 

Gardner, M. The Unexpected Hanging and Other Mathematical Diversions Simon and Schuster New York, 1969, Chapter 2 (Knots and Borromean Rings), pp. 24-33. 

Scheme 10.20 Synthetic molecular Borromean rings and a Solomon knot reported by Stoddart and coworkers. 

Fig. 4 The Borromean Rings (BRs). (a) The orthogonal perspective of BRs visualizes the three inseparable rings, where breaking one ring would unlink the other two. (b) BRs appear on the Borromeo family crest, (c) The use of BRs to symbolize the Holy Trinity date back to the thirteenth century, (d) The Valknut is a Borromean Viking symbol found on ancient stone carvings...

Fig. 19 Technomorph representations of MIMs (a) [2]catenane, (b) Borromean Rings, (c) [2] rotaxane, and (d) suit[2]ane...

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