Which product design innovation did Texas Instruments introduce in 1990 that revolutionized mathematics education and became their signature brand feature?

Texas Instruments revolutionized mathematics education with their graphing calculators, becoming essential tools in classrooms worldwide. Behind these iconic devices are fascinating product design decisions, marketing strategies, and brand recognition elements that have helped them dominate the educational calculator market for decades. Test your knowledge about how this mathematical tool became a classroom staple through clever product design and branding!

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The TI-81 graphing calculator with the ability to plot functions
The abacus-inspired sliding calculation panel
The mathematical word processor with equation editor
The digital compass with geometric construction tools