The symbol "π-" represents a mathematical constant known as pi, which is approximately equal to 3.14. It is used to calculate the circumference and area of circles. The value of pi is an irrational number, meaning it cannot be expressed as a simple fraction and its decimal representation goes on forever without repeating.
In mathematics, "π-" can also refer to the concept of pi in various formulas and equations. It appears in geometry, trigonometry, and calculus, making it essential for understanding circular shapes and periodic functions. The study of pi has fascinated mathematicians for centuries, leading to numerous discoveries and approximations.