Which mathematics-focused retail innovation, introduced in 1972, fundamentally changed how people performed calculations and eventually led to a global brand valued at over $10 billion?

The intersection of mathematics and retail innovation has produced some of the most transformative tools in modern commerce. From algorithmic recommendation systems to complex inventory optimization models, mathematical principles drive retail success in the digital age. This trivia question explores a pivotal retail innovation that revolutionized how we interact with mathematical tools in everyday commerce.

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Texas Instruments' first portable scientific calculator (TI-2500)
Hewlett-Packard's HP-35 scientific pocket calculator
Casio's first electronic calculator (Model 14-A)
Sharp's EL-8 electronic calculator, the world's first to use LSI circuits