Which of these calculator brands was named after a mathematical concept rather than its founder?

In the intersection of mathematics and branding, some companies have made their mark by leveraging mathematical concepts, symbols, or names. This trivia question explores how mathematics has influenced brand identity in products that mathematicians, educators, and students use daily. Test your knowledge of how mathematical principles have shaped commercial products in the educational technology space!

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Casio (named after founder Kashio Tadao)
Texas Instruments (named after the company's origin state)
HP (named after founders Hewlett and Packard)
Pi (named after the mathematical constant π)