Which of these brands correctly uses the mathematical symbol or concept in its logo or brand identity?

Mathematics and marketing might seem worlds apart, but some brands have cleverly incorporated mathematical concepts into their logos, branding strategies, and corporate identities. This poll tests your knowledge of how mathematical symbols, concepts, and principles have been used in famous brand identities. Can you identify which mathematical element has been accurately paired with its corresponding brand?

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Mathematica software's logo features a Möbius strip, representing the infinite possibilities of computational mathematics
The Texas Instruments logo incorporates the golden ratio in its dimensions to appeal to mathematics enthusiasts
The Khan Academy owl mascot contains exactly 3.14 (pi) geometric shapes in its design
Casio calculator branding features a stylized fractal pattern representing computational complexity