Symbol  Format  Data 

ā  Code Point 
U+0101 
TeX 
\bar{a} 

SVG 
The "a bar" symbol (ā) is often used to denote an averaged quantity or a complex conjugate.
The latin letter a is used to represent a variable or coefficient.
The latin letter b is used to represent a variable or coefficient.
The Latin small letter x is used to represent a variable or coefficient. In algebra, x is often used to represent an unknown value. The symbol x is also used to represent the horizontal dimension in the 2D cartesian coordinate system.
The Latin letter y is used to represent a variable or coefficient. Most commonly, y is the vertical dimension in the 2D cartesian coordinate system.
The Latin letter z is used to represent a variable or coefficient. The symbol z is also used to represent the up/down dimension in the 3D cartesian coordinate system.