Which calculator company famously used the mathematical constant π (3.14159...) in their product advertising campaign that significantly boosted their market share in educational markets?

The intersection of mathematics and retail product development has led to some fascinating innovations and strategies. From optimization algorithms that determine product placement to statistical models that predict consumer behavior, mathematics plays a crucial role in how products are developed and marketed. This trivia question explores a notable case study where mathematical principles revolutionized a retail strategy.

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Texas Instruments with their 'π Day' calculator discounts
Casio with their 'Circle of Knowledge' campaign
HP with their 'Calculating π to a Million Digits' challenge
Sharp with their 'π-fect Precision' marketing series