X, or x, is the twenty-fourth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ex (pronounced /ˈɛks/ ), plural exes.
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👉 X in the context of Xi (letter)
Xi (/zaɪ/ ZY or /(k)saɪ/ (K)SY; uppercase Ξ, lowercase ξ; Greek: ξι) is the fourteenth letter of the Greek alphabet, representing the voiceless consonant cluster [ks]. Its name is pronounced [ksi] https://upload.wikimedia.org/wikipedia/commons/3/3c/De-Xi.ogg in both Ancient Greek and Modern Greek. In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh 
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Xi is distinct from the letter chi, which gave its form to the Latin letter X.
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X in the context of Mole fraction
In chemistry, the mole fraction or molar fraction, also called mole proportion or molar proportion, is a quantity defined as the ratio between the amount of a constituent substance, ni (expressed in unit of moles, symbol mol), and the total amount of all constituents in a mixture, ntot (also expressed in moles):
It is denoted xi (lowercase Roman letter x), sometimes χi (lowercase Greek letter chi). (For mixtures of gases, the letter y is recommended.)
X in the context of Cross
The cross is a geometrical figure consisting of two intersecting lines or bars, usually perpendicular to each other. The lines usually run vertically and horizontally. A cross of oblique lines, in the shape of the Latin letter X, is also termed a saltire in heraldic terminology. Throughout centuries the cross in its various shapes and forms was a symbol of various beliefs.
The cross has been widely taken as an official symbol of the Christian faith exclusively from an early period in that religion's history to present. In pre-Christian times, it was used as a religious or cultural symbol throughout Europe, in west and south Asia (the latter, in the form of the original swastika); and in Ancient Egypt, where the Ankh was a hieroglyph that represented "life" and was used in the worship of the god Aten. It often appeared in conjunction with the female-genital circle or oval to signify the sacred marriage, as in the Egyptian amulet Nefer, which features the male cross and female orb, considered an amulet of blessedness and a charm of sexual harmony.