Symbol  Format  Data 

x̄  Code Point  U+0078 
TeX  \bar{x} 

SVG 
The x bar (x̄) symbol is used in statistics to represent the sample mean, or average, of a set of values. It’s calculated by adding up all the numbers in the sample and then dividing by the number of values in that sample. Read more…
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 combining macron is a unicode character used to draw a macron (horizontal bar) over the symbol it is combined with.
The Greek letter σ (sigma) is used in statistics to represent the standard deviation of a population.
The Greek letter μ (mu) is used in statistics to represent the population mean of a distribution.
The sample mean, also called the arithmetic mean, is the average of a sample space. To calculate the sample mean, sum all the data points in a sample space and then divide by the number of elements.