Which mathematical constant was central to the 'Infinite Precision' campaign that transformed how graphing calculators were marketed to high schools in 2018?

In the world of mathematics education products, marketing strategies often leverage specific mathematical concepts to attract educators and students. This trivia question explores how a famous mathematical constant has been utilized in a groundbreaking retail campaign that revolutionized how educational materials are marketed to schools and universities.

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Pi (π) - The campaign featured 3.14159... days of decreasing prices
Euler's number (e) - The campaign used exponential growth models to demonstrate calculator efficiency
Golden Ratio (φ) - The campaign highlighted calculator designs based on 1.618... proportions
Feigenbaum constant (δ) - The campaign showcased chaos theory applications in statistical analysis