The symbol \frac\pi2 represents half of the mathematical constant \pi, which is approximately equal to 3.14. This constant is crucial in geometry, particularly in calculations involving circles. It is defined as the ratio of a circle's circumference to its diameter. In trigonometry, \frac\pi2 radians is equivalent to 90 degrees. This angle is significant because it represents a right angle, which is fundamental in various mathematical and engineering applications. Understanding \frac\pi2 helps in solving problems related to angles, circles, and periodic functions.