Which mathematical constant was cleverly incorporated into the marketing campaign and logo design of a popular calculator brand, becoming central to their brand storytelling?

The intersection of mathematics and product marketing creates powerful tools for consumer engagement. From recommendation algorithms to statistical analysis of consumer behavior, math drives modern retail success. This poll tests your knowledge of how a famous mathematical concept was brilliantly incorporated into a retail brand's marketing campaign, creating one of the most recognizable product identities in academic supplies.

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Pi (π) - featured in Texas Instruments' marketing as 'Calculated Inspiration'
Euler's number (e) - used in Casio's 'Natural Mathematics' campaign
Golden Ratio (φ) - central to HP's 'Perfect Proportion' calculator series
Fibonacci Sequence - featured in Sharp's 'Naturally Sequential' product line