Which calculator brand created a marketing sensation by incorporating the golden ratio (approximately 1.618) into both its product design and retail strategy, leading to record sales in the educational market?

The world of mathematics has seen some remarkable retail successes, with educational tools and calculators becoming bestsellers in academic markets. One particular product revolutionized how students approached complex mathematical concepts through clever marketing and design. This poll tests your knowledge about a famous mathematical product that became a retail phenomenon through innovative marketing, strategic educational partnerships, and a distinctive design element.

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Polyhedral Mathematics' 'Golden Calculator' with its pentagonal case designed to golden ratio proportions
Texas Instruments' 'Phi Series' which used 1.618:1 aspect ratio screens
Fibonacci Computing's 'Spiral' calculator with a logarithmic spiral navigation system
Euclid Electronics' 'Divine Proportion' calculator with packaging that unfolded in golden rectangles