Which mathematical ratio, approximately equal to 1.618, has been widely adopted in product design for its aesthetically pleasing properties and is featured in Apple's logo design?

In the world of product design, mathematics plays a crucial role in creating visually appealing and functionally superior products. The mathematical principles that guide design decisions often go unnoticed by consumers but are meticulously implemented by designers. This poll tests your knowledge about how a specific mathematical concept transformed product design philosophy across multiple industries.

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The Golden Ratio (φ)
Euler's Number (e)
The Silver Ratio (δ)
The Plastic Number (ρ)