xI

Xi is a term with several distinct meanings across languages and disciplines. In the Greek alphabet, Xi (uppercase Ξ, lowercase ξ) is the 14th letter and is used in various scientific and mathematical notations as a symbol or variable. In astronomy, Bayer designations use the letter Xi to label certain stars within a constellation, typically followed by the genus name.

In Chinese contexts, Xi is a romanization of several surnames and given names, most commonly associated with the surname 习 (pinyin: Xí). Surnames rendered as Xi in English come from different Chinese characters and tones, and the pronunciation can vary accordingly. The name has become widely recognized internationally in relation to contemporary public figures and global discourse.

A prominent contemporary bearer of the surname in public life is Xi Jinping, who has served as the general secretary of the Communist Party of China and as the president of the People’s Republic of China since the 2010s. The use of Xi in this political context reflects one of several possible origins of the term in Chinese nomenclature, rather than a single universal meaning.