U+03BE "ξ" Greek Small Letter Xi Unicode Character

U+03BE "ξ" Greek Small Letter Xi is the fourteenth letter of the Greek alphabet and represents the voiceless velar fricative sound, similar to the "x" in "box" in English, though in modern Greek it is pronounced as "ks." In ancient Greek, it held a numeric value of 60 in the Greek numeral system. This character is widely used in mathematics, science, and engineering to denote variables such as a random variable in probability, the damping ratio in control theory, or the Riemann Xi function in number theory. Its visual form resembles a stylized trident or three horizontal strokes, making it distinct from other Greek letters.