X, x （英文：ex；英语个音标：/ɛks/）是拉丁字母中个第24个字母。拉北约音标字母中使用X-Ray来表示X。
/ks/音拉古代个西部希腊语中用“Χ”（Chi）字母来表示；而拉古代个东部希腊语中用“Ξ”（Xi）字母来表示，“Χ”（Chi）字母只表示/x/。
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