Which mathematical consumer product, first released in 1972, featured the distinctive logo of a lowercase 'hp' within a circle and revolutionized scientific calculations?

Before digital calculators and computers revolutionized mathematics, various tools and products were essential for mathematical calculations. From ancient counting boards to mechanical calculators, these products shaped how mathematics developed as both an academic discipline and practical skill. This trivia question explores a famous mathematical consumer product that transformed accessibility to complex calculations in the mid-20th century.

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The Hewlett-Packard HP-35, the world's first scientific pocket calculator with trigonometric and exponential functions
The Texas Instruments SR-10, marketed as the first truly portable electronic slide rule replacement
The Casio fx-1, Japan's pioneering entry into the scientific calculator market featuring algebraic notation
The Sharp EL-8, advertised as 'the calculator that fits in your pocket' with four-function capabilities