Chi Classic Round Sticker

In ancient times, some dialects of Greek used the chi instead of xi to represent the /ks/ sound. This was borrowed into the early Latin language, which led to the letter X being used for the same sound in Latin, and the modern languages which use the Latin alphabet. Chi also was included into Cyrillic alphabet (as letter ?), with the phonetic value /x/ or /h/. Chi is the basis for the name Chiastic structure and the name of Chiasmus. In Plato's Timaeus, it is explained that the two bands which form the soul of the world cross each other like the letter ?. Chi or X is often used to abbreviate the name Christ, as in the holiday Christmas (Xmas)