Which mathematical concept was central to the highly successful 2019 rebrand of a major educational technology company that specializes in mathematics software?

In the intersection of mathematics and product marketing lies a fascinating world where numbers meet branding strategy. Mathematical tools and concepts have been used in innovative product launches and brand campaigns that specifically target mathematicians, educators, and STEM enthusiasts. This poll tests your knowledge of how mathematical concepts have been leveraged in notable product marketing campaigns.

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The Golden Ratio (1.618...), used in their new logo design and visual identity system
Fibonacci Sequence, incorporated as a pattern in their product packaging and website layout
Möbius Strip, featured as a 3D animated mascot in their digital advertising campaign
Mandelbrot Set fractals, used as the basis for their interactive social media campaign