Which calculator company adopted the distinctive 'elliptic curve' logo in 1985, representing both mathematical elegance and the company's initial letter?

Throughout history, calculator and mathematical software companies have developed distinctive brand identities that mathematicians, educators, and students recognize instantly. These logos, color schemes, and design elements often incorporate mathematical symbols or concepts that reflect the precision and logic of the products they represent. Test your knowledge of mathematical product branding in this challenging trivia question!

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Casio, with its logo designed to resemble a stylized integral symbol
Texas Instruments, with its logo incorporating the golden ratio in its proportions
HP (Hewlett-Packard), with its logo based on a modified parabolic function
Sharp, with its logo designed to evoke precision measurement tools