Which mathematical concept directly inspired the logo design of Wolfram Research, the company behind Mathematica and Wolfram Alpha?

Mathematics has influenced corporate branding in fascinating ways! Many companies use mathematical concepts in their logos and brand identities to convey precision, innovation, and analytical thinking. This poll tests your knowledge of how math-focused companies have incorporated mathematical elements into their visual identities. Can you identify which famous mathematical symbol or concept inspired the following logo design?

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The Spikey: a three-dimensional mathematical shape based on the rhombic hexecontahedron
The Golden Ratio: their logo incorporates the Fibonacci spiral with precise proportional measurements
Klein Bottle: a non-orientable surface with no inside or outside, represented in their infinity-shaped logo
Mandelbrot Set: their logo features a stylized portion of this famous fractal pattern