x2

X2 can refer to several different concepts, the most common of which are mathematical and cultural in nature. In mathematics, x squared is written as x^2 and denoted as the second power of x. For real numbers, x^2 is always non-negative; the graph of y = x^2 is a parabola opening upward with its vertex at the origin. The domain is all real numbers and the range is [0, ∞). The operation is fundamental to quadratic functions, areas, physics formulas, and many parts of algebra.

In popular culture, X2 is the stylized title of X2: X-Men United, a 2003 film that serves as the second installment in the X-Men movie series. The film expanded the franchise’s plot around mutant rights, identity, and conflict, and it is commonly referred to simply as X2.

Beyond mathematics and film, the designation X2 is used as a model name or version identifier in various products and software, signaling a second edition or enhanced capabilities. It appears across different industries as a branding choice to convey improvement or doubling of features relative to a prior version, without prescribing a specific product type.

Overall, X2 functions as either a mathematical notation for squaring a variable or as a general branding element used in media and consumer electronics to denote a newer or doubled version. See also squared, exponentiation.