Which calculator company famously rebranded in 1967, changing their logo from a mathematical equation to a distinctive angular typeface that's still recognized in classrooms worldwide today?

The tools we use for mathematical calculations have evolved dramatically over centuries, from abacuses to digital calculators. Behind these tools are innovative companies that revolutionized how we approach mathematics. This poll explores the branding history of one such influential company that shaped mathematical education and professional computing. Test your knowledge about this iconic brand's evolution and its impact on mathematical tools!

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Texas Instruments, shifting from a circuit diagram logo to their red and black 'TI' logo
Casio, transitioning from a numerical formula to their current blue square logo
HP (Hewlett-Packard), moving from a calculus symbol to their slanted 'hp' emblem
Sharp, changing from an integral sign to their current pointed 'S' design