Which calculator company's product became so essential for advanced mathematics that it transformed its brand logo into a status symbol in STEM education during the 1990s-2000s?

Throughout history, certain mathematical tools and technologies have transformed how we learn and apply mathematics. Their brand identities became synonymous with mathematical education and advancement. This trivia question explores how one company's innovative branding and product design revolutionized calculus education in the digital age.

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Texas Instruments (TI), whose graphing calculators became mandatory in many calculus classrooms
Casio, whose scientific calculators dominated the market through celebrity mathematician endorsements
HP, whose reverse Polish notation calculators were marketed through university partnerships
Sharp, whose EL series featured revolutionary display technology advertised by Nobel Prize winners