Which calculator company famously pivoted their logo design in the 1970s to incorporate a hidden mathematical message that represented their commitment to innovation?

The tools mathematicians use have evolved significantly over centuries, from abacuses to calculators to sophisticated software. Major companies have shaped this evolution through innovative product development and strategic brand positioning. This poll tests your knowledge about one of the most significant brand transformations in mathematical computing tools that revolutionized how calculations are performed in academic and professional settings.

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Texas Instruments, whose logo contained a stylized integral symbol representing calculus capabilities
Hewlett-Packard, whose logo featured a hidden '41' referencing their groundbreaking HP-41C programmable calculator
Casio, whose logo redesign included a subtle waveform pattern symbolizing their scientific calculator functions
Sharp, whose logo incorporated the golden ratio proportions to emphasize precision in mathematical calculations