The story behind ‘X’

What is the common matter among these examples: ‘Project X’, ‘X-file’, ‘TEDx’, ‘Malcolm X’, and the ‘X’ angle in Mathematics? Exactly, it is the character X which refers to an UNKNOWN matter. But, the question is: Why do we always use the letter X as a symbol of the unknown?
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Sham El-Nessim

Sham El-Nessim is a feast celebrated by Egyptians. The word “Sham El-Nessim” is an Arabic word borrowed from Coptic “Ϭⲱⲙ ̀ⲛⲛⲓⲥⲓⲙ“. This feast always follows the Eastern Christian Easter (according to the custom of the largest Christian denomination in Egypt, The Coptic Orthodox Church). It refers to the beginning of the spring.

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