Atoms and molecules in crystals found in nature are arranged periodically.
The conventional way of identifying a crystal structure is by analyzing their diffraction pattern of energetic electron beams or x-ray radiation. The shapes of the facets of periodic crystals are triangles, squares or hexagons.
The diffraction pattern of such crystals has a cubic or hexagonal symmetry. Five fold symmetric periodic crystals are forbidden in nature since it is mathematically proven impossible to fill the entire space with five fold symmetric periodic lattice. Dan Shechtman studied aluminum- manganese alloys utilizing the diffraction analysis of their structures in electron microscope.
To his surprise, he discovered ten-fold symmetry of the diffraction pattern, indicating the existence of a five-fold symmetric crystal. The community of physicists in the field objected to the findings because of the controversy between the observed results with the mathematical statements at that time, Prof. Shechtman has rejected any possibility that the ten-fold symmetry of the diffraction pattern has raised from defects and took a firm position that the experiment prove the existence of these five-fold symmetric crystals, which are not periodic.
These crystals are now called quasi- crystals and by now many more alloys were found to be quasi crystals. For his discovery, Prof. Shechtman received the Nobel Prize in Chemistry for 2011.
The logo presents a diffraction pattern with a ten-fold symmetry that indicates the presence of quasi-crystals.