Pronunciation is: xi. (capital ξ, lowercase ξ) is the fourteenth Greek letter. Capital ξ is used for baryons in particle physics, and lowercase ξ is used for mathematical random variables. Greek alphabet is a letter used in Greek, and it is also widely used in mathematics, physics, biology, chemistry, astronomy and other disciplines.

Introduction:

Greek alphabet, similar to Latin alphabet and Cyrillic alphabet, is a complete phonemic text. Greek alphabet is the earliest writing system in the world in which letters represent vowels and phonemes.

Cyrillic alphabet and Georgian alphabet used in Russian, Ukrainian, etc. Are all developed from the Greek alphabet. Some Greek words related to Greek letters have entered many languages. For example, the word Delta comes from the Greek letter δ, because the shape of δ is a triangle.