Which calculator company's logo features a specific mathematical constant subtly integrated into its design?

Mathematical concepts have influenced numerous corporate logos, combining brand identity with numerical precision. From geometric patterns to advanced mathematical principles, these logos communicate more than meets the eye. This poll explores how mathematical symbols and concepts have been cleverly incorporated into well-known logos, showcasing the intersection of mathematics and marketing design. Test your knowledge about these mathematically-inspired brand identities!

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Casio - with a stylized representation of the Golden Ratio (φ ≈ 1.618) in its logo structure
Texas Instruments - with the number π (3.14159...) hidden in the curved elements of their logo
HP - with the slope of their logo precisely set to represent the natural logarithm base e (2.71828...)
Sharp - with its logo angles deliberately designed to form a 60° angle representing mathematical precision