X

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X might refer to:

For those of you in the mood, RationalWiki has a fun article about X.

• X, a letter of the roman alphabet. Very similar in appearance to the Greek letter Χ (chi), or the Cyrillic letter Х (kha), or the Phoenician letter taw.
• X-Mas, where the "X" is from the Greek letter chi, abbreviating the word for Christ, Χριστος.
• X is the Roman numeral for the number 10.
• In mathematics, x is commonly the name of an independent variable or unknown value. Also typically the horizontal axis in the Cartesian coordinate system.
• Sometimes a typographic approximation for the multiplication sign ×.
• Placeholder name for something unknown, for example in Planet X, X-Files, and Malcolm X.
• Archaic abbreviation for Χριστος (Christ) which lives on in X-Mas.
• X (social media), formerly known as Twitter.
• Indicating pornographic content, as in X-rated, or XXX.
• Fun:X