X Symbol
The latin letter x is used to represent a variable or coefficient. In algebra, x is often used to represent an unkown value. The symbol x is also used to represent the horizontal dimension in the 2D cartesian coordinate system.
Format  Display  Data 

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TeX 


Unicode  x 

Usage
Multiplication Variables  Notation
In mathematics when two variables are next to each other the implied operation is multiplication. This makes many equations and formulas more simple.
Variable  Notation
A variable is a letter or symbol that represents a value that either changes or is unknown.