The term for a circle’s circumference divided by its diameter is "pi," represented by the Greek letter π. Pi is a mathematical constant, approximately equal to 3.14159, and it appears in various formulas related to circles and geometry. This relationship remains consistent regardless of the circle's size, demonstrating a fundamental property of Euclidean geometry. As a transcendental number, pi has infinite non-repeating decimal places, making it a topic of fascination for mathematicians. Pi is not only crucial in geometry but also finds applications in engineering, physics, and various scientific fields, reinforcing its significance in mathematics.